The Outcome of Antibiotic Overuse before and during the COVID-19 Pandemic in a Tertiary Care Hospital in Oman

Antimicrobial resistance (AMR), a serious global public health challenge, may have accelerated development during the COVID-19 pandemic because antibiotics were prescribed for COVID-19. This study aimed to assess antibiotics use before and during the pandemic and correlate the results with the rate of resistant microorganisms detected in hospitalized patients during the study period. This single-center study looked retrospectively at four years of data (2018-2021) from Royal Hospital, Muscat, which is the biggest hospital in Oman with approximately 60,000 hospital admissions yearly. The consumption rate of ceftriaxone, piperacillin tazobactam, meropenem, and vancomycin was presented as the antibiotic consumption index, the ratio of defined daily dose (DDD) per 100 bed days. Analyses were performed using the nonparametric test for trend across the study period. Correlation between antibiotic consumption indexes and the isolated microorganisms in the four-year study period was performed using Spearman's rank correlation coefficient. We compared data from the pre-COVID-19 to the COVID-19 period. Though more patients were admitted pre-COVID-19 (132,828 versus 119,191 during COVID-19), more antibiotics were consumed during the pandemic (7350 versus 7915); vancomycin and ceftriaxone had higher consumption during than before the pandemic (p-values 0.001 and 0.036, respectively). Vancomycin-resistant Enterococcus (VRE) and Candida auris were detected more during the COVID-19 period with p-values of 0.026 and 0.004, respectively. Carbapenem-resistant Enterobacterales (CRE), vancomycin-resistant Enterococcus spp., and C. auris were detected more often during the pandemic with p-values of 0.011, 0.002, and 0.03, respectively. Significant positive correlations between antibiotic consumption and drug-resistant isolates were noted. This study confirms that the overuse of antibiotics triggers the development of bacterial resistance; our results emphasize the importance of antibiotic control.

Prospective analysis of febrile neutropenia patients with bacteraemia: the results of an international ID-IRI study

OBJECTIVES

Bacteraemia during the course of neutropenia is often fatal. We aimed to identify factors predicting mortality to have an insight into better clinical management.

METHODS

The study has a prospective, observational design using pooled data from febrile neutropenia patients with bacteraemia in 41 centres in 16 countries. Polymicrobial bacteraemias were excluded. It was performed through the Infectious Diseases-International Research Initiative platform between 17 March 2021 and June 2021. Univariate analysis followed by a multivariate binary logistic regression model was used to determine independent predictors of 30-d in-hospital mortality (sensitivity, 81.2%; specificity, 65%).

RESULTS

A total of 431 patients were enrolled, and 85 (19.7%) died. Haematological malignancies were detected in 361 (83.7%) patients. Escherichia coli (n = 117, 27.1%), Klebsiellae (n = 95, 22% %), Pseudomonadaceae (n = 63, 14.6%), Coagulase-negative Staphylococci (n = 57, 13.2%), Staphylococcus aureus (n = 30, 7%), and Enterococci (n = 21, 4.9%) were the common pathogens. Meropenem and piperacillin-tazobactam susceptibility, among the isolated pathogens, were only 66.1% and 53.6%, respectively. Pulse rate (odds ratio [OR], 1.018; 95% confidence interval [CI], 1.002-1.034), quick SOFA score (OR, 2.857; 95% CI, 2.120-3.851), inappropriate antimicrobial treatment (OR, 1.774; 95% CI, 1.011-3.851), Gram-negative bacteraemia (OR, 2.894; 95% CI, 1.437-5.825), bacteraemia of non-urinary origin (OR, 11.262; 95% CI, 1.368-92.720), and advancing age (OR, 1.017; 95% CI, 1.001-1.034) were independent predictors of mortality. Bacteraemia in our neutropenic patient population had distinctive characteristics. The severity of infection and the way to control it with appropriate antimicrobials, and local epidemiological data, came forward.

CONCLUSIONS

Local antibiotic susceptibility profiles should be integrated into therapeutic recommendations, and infection control and prevention measures should be prioritised in this era of rapidly increasing antibiotic resistance.

Enterobius vermicularis Related Acute Appendicitis: A Case Report and Review of the Literature

While the debate on the association between Enterobius vermicularis (E. vermicularis) and acute appendicitis has not been settled, a few case reports of this very rare encounter are beginning to come to light. E. vermicularis is one of the most common parasitic infections around the world, and acute appendicitis, on the other hand, is also a commonly encountered condition in general surgery. However, the association between these two conditions remains controversial. Here we present a case report of a young woman with appendicitis associated with E. vermicularis.

Low Rate of Bacterial Coinfections and Antibiotic Overprescribing During COVID-19 Pandemic: A Retrospective Study from Oman

Objectives

The recommended treatment for COVID-19 includes antiviral drugs, corticosteroids, immunomodulatory drugs, low molecular weight heparin, as well as antibiotics. Although COVID-19 is a viral disease, many studies indicate that antibiotics are prescribed frequently, mainly to treat suspected bacterial coinfection. At the same time, the prevalence of bacterial coinfections during COVID-19 is rather low indicating the significant antibiotic overuse in these patients. It is well known that this can trigger antibiotic bacterial resistance, and once it emerges the reversal of resistance is a complex and long-lasting process. The aims of this study were to estimate the prevalence of bacterial coinfections during the COVID-19 and to analyze the antibiotic treatment justification during this pandemic in Oman.

Methods

This retrospective analysis was conducted using the Royal Hospital COVID-19 Registry Database. The study analyzed demographic and clinical characteristics, as well as laboratory parameters and antibiotic treatment of hospitalized patients.

Results

During the study period, 584 patients were enrolled in the analysis. Coinfection was rare as it was confirmed in 0.9% of patients. Superinfections were present in 15.2% of patients. Gram-negative bacteria were isolated in 95 (69.9%) samples, gram-positive bacteria in 25 (18.4%) samples, while Candida spp. was found in 16 (11.8%) samples. On admission, empirical antibiotic treatment was started in 543 (93.0%) patients.

Conclusions

During COVID-19, coinfections are rarely seen and the overuse of antibiotics is not justified. The incidence of superinfections is the same as in other patients in healthcare settings caused by the same resistant microorganisms, which implies the use of even more.

Physicians' attitudes, knowledge, and practices regarding antibiotic prescriptions

OBJECTIVES

Inappropriate and overuse of antimicrobials, incorrect dosing, and extended duration are some of the leading causes of antibiotic-resistance that have led to the development of antimicrobial resistance (AMR). We aimed to evaluate knowledge, attitudes, and practices regarding rational antibiotic prescribing among physicians in a teaching hospital in Oman, with the goal of identifying knowledge gaps and interventions that could lead to judicious use of antimicrobials and reduce the emergence of resistant organisms METHODS: A cross-sectional study assessing physicians' knowledge of and attitudes towards prescribing antibiotics was conducted at the Royal Hospital from 15 January to 31 March 2020. Likert scales were used to evaluate physicians' awareness and perception of personal performance regarding the care of patients with infections and rational use of antibiotics.

RESULTS

Inadequate hand washing was regarded as the most important factor contributing to AMR (51.6%), followed by widespread use of antibiotics (49%), prescribing broad-spectrum antibiotics (47.3%), lack of effective narrow-spectrum antibiotics (47.3%), inappropriate duration of antibiotic therapy (46.2%), inappropriate empirical choice of antibiotics (45.1%), poor access to information on local antibiotic resistance patterns (40.8%), and inadequate restrictions on antibiotic prescribing (34.4%). Other factors contributing to AMR such as lack of local hospital guidelines on antibiotic usage, random mutations in microbes, patient demands and expectations for antibiotics, and the role of pharmaceutical companies in advertising and promoting use of antibiotics were deemed important by 33.3%, 26.8%, 22.5% and 20.4%, respectively.

CONCLUSIONS

AMR is a global health threat with significant effect on the health system and the economy. Misuse and overuse of antimicrobials remain the main drivers for the development of drug-resistant pathogens. Identifying knowledge gaps and planning interventions that could lead to judicious use of antimicrobials including establishing an Antimicrobial Stewardship Program are of paramount importance in reducing AMR in the twenty-first century and beyond.

Varicella Zoster Virus Vasculopathy; an HIV adult presenting with multiple strokes

VZV vasculopathy has been associated with granulomatous vasculitis where there is vessel wall damage and transmural inflammation. VZV vasculopathy has been previously called granulomatous angiitis, VZV vasculitis or post-varicella arteriopathy. Intracerebral VZV vasculopathy can occur in children and adults, either after primary infection or after viral reactivation. Where-as varicella primary infection is a common cause of stroke in children, in adults there is an increased risk of stroke after herpes zoster. Here we present a 38-year-old immunocompromised patient who presents to us with multiple cerebral infarcts post primary infection and imaging showing distribution similar to those in children.

Factors leading to dissemination of cutaneous anthrax: an international ID-IRI study

Background

Although anthrax is a rare zoonotic infection, it still causes significant mortality and morbidity. In this multicenter study, which is the largest anthrax case series ever reported, we aimed to describe the factors leading to dissemination of cutaneous anthrax.

Methods

Adult patients with cutaneous anthrax from 16 referral centers were pooled. The study had a retrospective design, and included patients treated between January 1, 1990 and December 1, 2019. Probable, and confirmed cases based upon CDC anthrax 2018 case definition were included in the study. A descriptive statistical analysis was performed for all variables.

Results

A total of 141 cutaneous anthrax patients were included. Of these, 105 (74%) patients had probable and 36 (26%) had confirmed diagnosis. Anthrax meningitis and bacteremia occurred in three and six patients, respectively. Sequelae were observed in three patients: cicatricial ectropion followed by ocular anthrax (n = 2) and movement restriction on the left hand after surgical intervention (n = 1). One patient had gastrointestinal anthrax. The parameters related to poor outcome (p < 0.05) were fever, anorexia, hypoxia, malaise/fatigue, cellulitis, fasciitis, lymphadenopathy, leukocytosis, high CRP and creatinine levels, longer duration of antimicrobial therapy, and combined therapy. The last two were seemingly the consequences of dissemination rather than being the reasons. The fatality rate was 1.4%.

Conclusions

Rapid identification of anthrax is crucial for prompt and effective treatment. Systemic symptoms, disseminated local infection, and high inflammatory markers should alert the treating physicians for the dissemination of the disease.

Vector-borne and zoonotic infections and their relationships with regional and socioeconomic statuses: An ID-IRI survey in 24 countries of Europe, Africa and Asia

BACKGROUND

In this cross-sectional, international study, we aimed to analyze vector-borne and zoonotic infections (VBZI), which are significant global threats.

METHOD

VBZIs' data between May 20-28, 2018 was collected. The 24 Participatingcountries were classified as lower-middle, upper-middle, and high-income.

RESULTS

382 patients were included. 175(45.8%) were hospitalized, most commonly in Croatia, Egypt, and Romania(P = 0.001). There was a significant difference between distributions of VBZIs according to geographical regions(P < 0.001). Amebiasis, Ancylostomiasis, Blastocystosis, Cryptosporidiosis, Giardiasis, Toxoplasmosis were significantly more common in the Middle-East while Bartonellosis, Borreliosis, Cat Scratch Disease, Hantavirus syndrome, Rickettsiosis, Campylobacteriosis, Salmonellosis in Central/East/South-East Europe; Brucellosis and Echinococcosis in Central/West Asia; Campylobacteriosis, Chikungunya, Tick-borne encephalitis, Visceral Leishmaniasis, Salmonellosis, Toxoplasmosis in the North-Mediterranean; CCHF, Cutaneous Leishmaniasis, Dengue, Malaria, Taeniasis, Salmonellosis in Indian Subcontinent; Lassa Fever in West Africa. There were significant regional differences for viral hemorrhagic fevers(P < 0.001) and tick-borne infections(P < 0.001), and according to economic status for VBZIs(P < 0.001). The prevalences of VBZIs were significantly higher in lower-middle income countries(P = 0.001). The most similar regions were the Indian Subcontinent and the Middle-East, the Indian Subcontinent and the North-Mediterranean, and the Middle-East and North-Mediterranean regions.

CONCLUSIONS

Regional and socioeconomic heterogeneity still exists for VBZIs. Control and eradication of VBZIs require evidence-based surveillance data, and multidisciplinary efforts.

International Multicentre Study of Candida auris Infections

Background:Candida auris has emerged globally as a multi-drug resistant yeast and is commonly associated with nosocomial outbreaks in ICUs. Methods: We conducted a retrospective observational multicentre study to determine the epidemiology of C. auris infections, its management strategies, patient outcomes, and infection prevention and control practices across 10 centres from five countries. Results: Significant risk factors for C. auris infection include the age group of 61–70 years (39%), recent history of ICU admission (63%), diabetes (63%), renal failure (52%), presence of CVC (91%) and previous history of antibiotic treatment (96%). C. auris was commonly isolated from blood (76%). Echinocandins were the most sensitive drugs. Most common antifungals used for treatment were caspofungin (40%), anidulafungin (28%) and micafungin (15%). The median duration of treatment was 20 days. Source removal was conductedin 74% patients. All-cause crude mortality rate after 30 days was 37%. Antifungal therapy was associated with a reduction in mortality (OR:0.27) and so was source removal (OR:0.74). Contact isolation precautions were followed in 87% patients. Conclusions:C. auris infection carries a high risk for associated mortality. The organism is mainly resistant to most azoles and even amphotericin-B. Targeted antifungal therapy, mainly an echinocandin, and source control are the prominent therapeutic approaches.

The Findings of Pulmonary Nocardiosis on Chest High Resolution Computed Tomography

Objectives

Pulmonary nocardiosis is a rare opportunistic infection that is often encountered in immunocompromised patients, in particular those with the HIV infection and in solid organ transplant recipients. As the number of immunocompromised patients increase, the number of patients with pulmonary nocardiosis is also expected to increase. This study aimed to analyse both the chest high resolution computed tomography (HRCT) findings of patients with confirmed pulmonary nocardiosis and review the imaging features of pulmonary nocardiosis in the literature.

Methods

This retrospective study was conducted at The Royal Hospital, Muscat, Oman, to identify patients with a diagnosis of pulmonary nocardiosis between January 2006 and January 2019. Accordingly, nine patients with pulmonary nocardiosis were identified, but three patients were excluded as no chest HRCT images were available. Patient clinical presentation was recorded and chest HRCT images were retrospectively reviewed.

Results

A total of six patients were enrolled in this study. All were male and with a mean age of 41 ± 11 years. Three patients were immunocompromised, two of whom had undergone a renal transplant. The main HRCT findings were cavitary nodules/masses, non-cavitary nodules/masses, septal thickening, centrilobular nodules, ground glass opacities, consolidation, pleural effusion, pleural thickening, enlarged lymph nodes and necrotic lymph nodes.

Conclusion

Pulmonary nocardiosis shows various findings in a chest CT, the most common of which are pulmonary nodules and masses. Awareness of these findings can help radiologists with a diagnosis in the appropriate clinical settings.

Convalescent Plasma Therapy in Critically Ill COVID-19 Patients: An Open Label Trial

OBJECTIVES

The novel severe acute respiratory syndrome coronavirus 2 pandemic continues to spread globally without an effective treatment. In search of the cure, convalescent plasma (CP) containing protective antibodies from survivors of coronavirus disease 2019 (COVID-19) infection has shown potential benefit in a non-intensive care unit setting. We sought to evaluate the effectiveness of CP therapy for patients with COVID-19 on mechanical ventilation (MV) and/or acute respiratory distress syndrome (ARDS).

METHODS

We conducted an open-label trial in a single center, Royal Hospital, in Oman. The study was conducted from 17 April to 20 June 2020. The trial included 94 participants with laboratory-confirmed COVID-19. The primary outcomes included extubation rates, discharges from the hospital and overall mortality, while secondary outcomes were the length of stay and improvement in respiratory and laboratory parameters. Analyses were performed using univariate statistics.

RESULTS

The overall mean age of the cohort was 50.0±15.0 years, and 90.4% (n = 85) were males. A total of 77.7% (n = 73) of patients received CP. Those on CP were associated with a higher extubation rate (35.6% vs. 76.2%; p < 0.001), higher extubation/home discharges rate (64.4% vs. 23.8%; p =0.001), and tendency towards lower overall mortality (19.2% vs. 28.6%; p =0.354; study power = 11.0%) when compared to COVID-19 patients that did not receive CP.

CONCLUSIONS

CP was associated with higher extubation/home discharges and a tendency towards lower overall mortality when compared to those that did not receive CP in COVID-19 patients on MV or in those with ARDS. Further studies are warranted to corroborate our findings.

Immunological predictors of disease severity in patients with COVID-19

Background

Identifying the immune cells involved in coronavirus disease 2019 (COVID-19) disease progression and the predictors of poor outcomes is important to manage patients adequately.

Methods

This prospective observational cohort study enrolled 48 patients with COVID-19 hospitalized in a tertiary hospital in Oman and 53 non-hospitalized patients with confirmed mild COVID-19.

Results

Hospitalized patients were older (58 years vs 36 years, P < 0.001) and had more comorbid conditions such as diabetes (65% vs 21% P < 0.001). Hospitalized patients had significantly higher inflammatory markers (P < 0.001): C-reactive protein (114 vs 4 mg/l), interleukin 6 (IL-6) (33 vs 3.71 pg/ml), lactate dehydrogenase (417 vs 214 U/l), ferritin (760 vs 196 ng/ml), fibrinogen (6 vs 3 g/l), D-dimer (1.0 vs 0.3 μg/ml), disseminated intravascular coagulopathy score (2 vs 0), and neutrophil/lymphocyte ratio (4 vs 1.1) (P < 0.001). On multivariate regression analysis, statistically significant independent early predictors of intensive care unit admission or death were higher levels of IL-6 (odds ratio 1.03, P = 0.03), frequency of large inflammatory monocytes (CD14+CD16+) (odds ratio 1.117, P = 0.010), and frequency of circulating naïve CD4+ T cells (CD27+CD28+CD45RA+CCR7+) (odds ratio 0.476, P = 0.03).

Conclusion

IL-6, the frequency of large inflammatory monocytes, and the frequency of circulating naïve CD4 T cells can be used as independent immunological predictors of poor outcomes in COVID-19 patients to prioritize critical care and resources.

Profiles of multidrug-resistant organisms among patients with bacteremia in intensive care units: an international ID-IRI survey

Evaluating trends in antibiotic resistance is a requisite. The study aimed to analyze the profile of multidrug-resistant organisms (MDROs) among hospitalized patients with bacteremia in intensive care units (ICUs) in a large geographical area. This is a 1-month cross-sectional survey for blood-borne pathogens in 57 ICUs from 24 countries with different income levels: lower-middle-income (LMI), upper-middle-income (UMI), and high-income (HI) countries. Multidrug-resistant (MDR), extensively drug-resistant (XDR), or pan-drug-resistant isolates were searched. Logistic regression analysis determined resistance predictors among MDROs. Community-acquired infections were comparable to hospital-acquired infections particularly in LMI (94/202; 46.5% vs 108/202; 53.5%). Although MDR (65.1%; 502/771) and XDR (4.9%; 38/771) were common, no pan-drug-resistant isolate was recovered. In total, 32.1% of MDR were Klebsiella pneumoniae, and 55.3% of XDR were Acinetobacter baumannii. The highest MDR and XDR rates were in UMI and LMI, respectively, with no XDR revealed from HI. Predictors of MDR acquisition were male gender (OR, 12.11; 95% CI, 3.025-15.585) and the hospital-acquired origin of bacteremia (OR, 2.643; 95%CI, 1.462-3.894), and XDR acquisition was due to bacteremia in UMI (OR, 3.344; 95%CI, 1.189-5.626) and admission to medical-surgical ICUs (OR, 1.481; 95% CI, 1.076-2.037). We confirm the urgent need to expand stewardship activities to community settings especially in LMI, with more paid attention to the drugs with a higher potential for resistance. Empowering microbiology laboratories and reports to direct prescribing decisions should be prioritized. Supporting stewardship in ICUs, the mixed medical-surgical ones in particular, is warranted.

Amebic Liver Abscess

Objectives

Amoebic liver abscess (ALA) is endemic to many areas of the world. This study sought to investigate the epidemiology, presentation, laboratory tests and imaging characteristics of ALA in Oman and ultimately determine whether it is native to Oman or originated abroad.

Methods

This case series study was conducted at the Royal Hospital, Muscat, Oman, from January 2013 to December 2017 with patients older than 13 years and having a discharge diagnosis of ALA. Patient data were extracted from the Royal Hospital patient database.

Results

22 patients were included in the study—18 Omani patients and four expatriates. Only two Omanis had a history of traveling abroad. There were 15 male patients and seven were female with an average age of 45.2 years. The most common presentation was abdominal pain, which was seen in 17 patients. Fever was seen in 13 patients. Alanine transferase was found to be elevated in 13 patients. The majority of patients (90%) had no symptomatic infections prior to developing ALA.

Conclusion

The data suggests that ALA is endemic to Oman, considering the high number of local patients and lack of travel abroad in this population. As the number of patients treated for ALA is rather small, it can be concluded that the occurrence of ALA is much lower in Oman than in other endemic areas. The majority of patients had no prior symptomatic infections; thus, a method of control involves screening to prevent amoebic spread.

The Role of Convalescent Plasma and Tocilizumab in the Management of COVID-19 Infection: A Cohort of 110 Patients from a Tertiary Care Hospital in Oman

AIM

As Coronavirus Disease-2019 (COVID-19) pandemic continues to evolve, the search for safe and effective therapeutic interventions remain essential.

METHODS

We conducted a retrospective cohort study on patients hospitalized with laboratory confirmed severe acute respiratory syndrome coronavirus-2 infection, comparing standard of care along with Convalescent Plasma with or without Tocilizumab (CP vs. CPT).

RESULTS

A total of 110 patients were enrolled with an overall mean age of 50 ± 16 years. Patients on CPT were more likely to have had acute respiratory distress syndrome (77% vs. 42%; p < 0.001), sepsis (9.7% vs. 0; p = 0.036), chest X-ray abnormalities (71% vs. 44%; p = 0.004), intensive care unit admission (84% vs. 56%; p = 0.001) as well as being on mechanical ventilation (79% vs. 48%; p = 0.001). After CPT treatment, all measured inflammatory markers, except interleukine-6, showed an overall steady decline over time (all p-values <0.05) and the ventilatory parameters showed significant improvement of PaO2/FiO2 ratio from 127 to 188 within 7 days (p < 0.001). Additionally, 52% (32/62) of the patients had favorable outcome, either as improvement of ventilatory parameters or extubation within 14 days of hospitalization. However, mortality rate in those on CPT was higher than those who received CP alone (24% vs. 8.3%; p = 0.041).

CONCLUSION

In patients with severe COVID-19 infection, using tocilizumab with convalescent plasma is associated with improvement in inflammatory and ventilatory parameters but no effect on mortality. These findings require validation from randomized clinical trials.

Prevalence and predictors of in-hospital mortality of patients hospitalized with COVID-19 infection

BACKGROUND

The severity and mortality from COVID-19 infection vary among populations. The aim of this study was to determine the prevalence and predictors of mortality among patients hospitalized with COVID-19 infection in a tertiary care hospital in Oman.

METHODS

We conducted a retrospective study using database that included: demographic, clinical characteristics, laboratory parameters, medications and clinical outcomes of all patients hospitalized in Royal Hospital, Muscat, Oman, between March 12, 2020 and December 1st 2020. Univariate and multivariate logistic regression was performed to investigate the relationship between each variable and the risk of death of COVID-19 infected patients.

RESULTS

In total,1002 patients with COVID-19 infection with mean age of the cohort was 54±16 years (65% (n=650) male) were included, with an overall and intensive care unit (ICU) mortalities of 26% (n=257) and 42% (n=199/473), respectively. The prevalence of ICU admission was 47% (n=473) and the need for mechanical ventilation was 41% (n=413). The overall length of stay in the ICU was 13 (9-21) days. Adjusting for other factors in the model, the multivariable logistic regression demonstrated that in-hospital mortality in admitted COVID-19 patients was associated with old age (p<0.001), heart diseases (adjusted odds ratio (aOR), 1.84; 95% confidence interval (CI): 1.11-3.03; p=0.018), liver diseases (aOR, 4.48; 95% CI: 1.04-19.3; p=0.044), those with higher ferritin levels (aOR, 1.00; 95% CI: 1.00-1.00; p=0.006), acute respiratory distress syndrome (ARDS) (aOR, 3.20; 95% CI: 1.65-6.18; p=0.001), sepsis (aOR, 1.77; 95% CI: 1.12-2.80; p=0.022), and those that had ICU admission (aOR, 2.22; 95% CI: 1.12-4.38; p=0.022).

CONCLUSION

In this cohort, mortality in hospitalized COVID-19 patients was high and was associated with advanced age, heart diseases, liver disease, high ferritin, ARDS, sepsis and ICU admission. These high-risk groups should be prioritized for COVID-19 vaccinations.

Characteristics of Pyogenic Liver Abscess

Objectives: Liver abscess can develop as a complication of hepatobiliary disease or other intraabdominal infections, but more recently it is associated with primary and secondary liver malignancies and their treatment. The goal of this study was to analyze the epidemiology, etiology and clinical characteristics of pyogenic liver abscess in Oman. The intention was to obtain the information needed for the adequate liver abscess empirical treatment. Methods: This retrospective study took place in a tertiary hospital. Consecutive patients treated for the liver abscess during the five years period, from January 2013 until the end of 2017, were enrolled. Their demographic and clinical data were used to study the characteristics of pyogenic liver abscess in Oman. Results: Fifty-three patients with pyogenic liver abscess were enrolled in the study. They were predominantly male and younger than 60 years. Klebsiella pneumoniae was the most usual bacteria causing the liver abscess. Clinical presentation was unspecific and the abdominal pain and high fever were the most usual symptoms. Conclusion: The majority of pyogenic liver abscesses are caused by K. pneumoniae so the empirical treatment should be started with antibiotic directed against it. Further studies are needed to establish the local role of anaerobic bacteria in pyogenic liver abscess as well as to monitor the presence of hypervirulent K. pneumoniae in Oman. Keywords: Pyogenic liver abscess; Etiology; Epidemiology; Klebsiella pneumoniae.

West nile virus infection: One-Year postkidney transplant

West Nile virus (WNV) infections are a mosquito-borne virus of the Flaviviridae family. The clinical feature of the virus varies between individuals from being asymptomatic in most of the cases to severe central nervous system disease manifested as meningitis, encephalitis, and paralysis. Diabetic nephropathy patient with microvascular and macrovascular complications, who received a kidney transplant a year ago on immunosuppressive therapy, presented with a three-day history of upper respiratory tract infection and fever. He lived in an endemic area of brucella infection. He underwent a thorough and full evaluation with various laboratory and radiological evaluations. The patient was started empirically on ceftriaxone and acyclovir for a presumptive diagnosis of herpes encephalitis and covering also Listeria with ampicillin. The patient did not improve with the initial management, so a T2-weighted magnetic resonance imaging of the brain executed that showed nonspecific hyper-intensity in the left frontal area suggestive of microangiopathic changes. WNV-neutralizing antibodies were positive with a high titer >1:640, whereas WNV RNA was not detected in the plasma sample. In the serum sample, WNV IgM and IgG were both positive. WNV IgM antibodies were detected with 6.55 and 5.97 antibody index and were done by a semiquantitative ELISA. Furthermore, WNV-neutralizing antibodies were positive as well as with a titer of 1:80. As there is no specific antiviral treatment available, the patient management was supportive; reduction in immunosuppressive agents and the use of IV IgG. This is the first reported case of one-year post renal transplant who developed WNV encephalitis and neuropathy with significant response to immunoglobulin after 18 days of infections.

Randomized controlled open label trial on the use of favipiravir combined with inhaled interferon beta-1b in hospitalized patients with moderate to severe COVID-19 pneumonia

OBJECTIVE

To evaluate the therapeutic effectiveness of favipiravir combined with inhaled interferon beta-1b in adult patients hospitalized with moderate to severe COVID-19 pneumonia.

METHODS

A randomized, open-label controlled trial of oral favipiravir in adults hospitalized with moderate to severe COVID-19 pneumonia from June 22nd 2020 to August 13th 2020 was conducted. Patients were randomly assigned to receive either a combination of favipiravir with interferon beta-1b by inhalation aerosol or hydroxychloroquine (HCQ). The outcome endpoints included improvement in inflammatory markers, lower length of hospital stay (LOS), discharges and lower overall 14-day mortality.

RESULTS

A total of 89 patients underwent randomization with 49% (n = 44) assigned to favipiravir and 51% (n = 45) assigned HCQ. The overall mean age was 55 ± 14 years and 58% (n = 52) were males. There were no significant differences in the inflammatory biomarkers at hospital discharge between the two groups; C-reactive protein (p = 0.413), ferritin (p = 0.968), lactate dehydrogenase (p = 0.259) and interleukin 6 (p = 0.410). There were also no significant differences between the two groups with regards to the overall LOS (7 vs 7 days; p = 0.948), transfers to the ICU (18.2% vs 17.8%; p = 0.960), discharges (65.9% vs 68.9%; p = 0.764) and overall mortality (11.4% vs 13.3%; p = 0.778).

CONCLUSIONS

No differences in clinical outcomes were found between favipiravir plus inhaled interferon beta-1b and hydroxychloroquine in adults hospitalized with moderate to severe COVID-19 pneumonia.

Clinical characteristics and outcomes of the first 63 adult patients hospitalized with COVID-19: An experience from Oman

INTRODUCTION

To identify the clinical characteristics and outcomes of hospitalized patients with COVID-19 in Oman.

METHODS

A case series of hospitalized COVID-19 laboratory-confirmed patients between February 24th through April 24th, 2020, from two hospitals in Oman. Analyses were performed using univariate statistics.

RESULTS

The cohort included 63 patients with an overall mean age of 48±16 years and 84% (n=53) were males. A total of 38% (n=24) of the hospitalized patients were admitted to intensive care unit (ICU). Fifty one percent (n=32) of patients had at least one co-morbidity with diabetes mellitus (DM) (32%; n=20) and hypertension (32%; n=20) as the most common co-morbidities followed by chronic heart and renal diseases (12.8%; n=8). The most common presenting symptoms at onset of illness were fever (84%; n=53), cough (75%; n=47) and shortness of breaths (59%; n=37). All except two patients (97%; n=61) were treated with either chloroquine or hydroxychloroquine, while the three most prescribed antibiotics were ceftriaxone (79%; n=50), azithromycin (71%; n=45), and the piperacillin/tazobactam combination (49%; n=31). A total of 59% (n=37), 49% (n=31) and 24% (n=15) of the patients were on lopinavir/ritonavir, interferons, or steroids, respectively. Mortality was documented in (8%; n=5) of the patients while 68% (n=43) of the study cohort recovered. Mortality was associated with those that were admitted to ICU (19% vs 0; p=0.009), mechanically ventilated (31% vs 0; p=0.001), had DM (20% vs 2.3%; p=0.032), older (62 vs 47 years; p=0.045), had high total bilirubin (43% vs 2.3%; p=0.007) and those with high C-reactive protein (186 vs 90mg/dL; p=0.009) and low corrected calcium (15% vs 0%; p=0.047).

CONCLUSIONS

ICU admission, those on mechanical ventilation, the elderly, those with high total bilirubin and low corrected calcium were associated with high mortality in hospitalized COVID-19 patients.

Therapeutic plasma exchange in adults with severe COVID-19 infection

OBJECTIVE

To evaluate the therapeutic use of plasma exchange in COVID-19 patients compared to controls.

METHODS

A case series of critically ill adult men and non-pregnant women, ≥18 years of age, with laboratory-confirmed COVID-19, was studied at the Royal Hospital, Oman, from April 17 to May 11, 2020. Therapeutic plasma exchange (TPE) was performed on patients admitted to the intensive care unit (ICU) with confirmed or imminent acute respiratory distress syndrome (ARDS) or severe pneumonia. The analysis was performed using univariate statistics.

RESULTS

A total of 31 COVID-19 patients were included with an overall mean age of 51±15 years (range: 27-76 years); 90% (n=28) were males, and 35% (n=11) of the patients had TPE as a mode of treatment. The TPE group was associated with higher extubation rates than the non-TPE cohort (73% versus 20%; p=0.018). Additionally, patients on TPE had a lower 14 days (0 versus 35%; p=0.033) and 28 days (0 versus 35%; p=0.033) post plasma exchange mortality compared to patients not on TPE. However, all-cause mortality was only marginally lower in the TPE group compared to the non-TPE group (9.1% versus 45%; p=0.055; power=66%). Laboratory and ventilatory parameters also improved post TPE (n = 11).

CONCLUSIONS

The use of TPE in severe COVID-19 patients has been associated with improved outcomes, however, randomized controlled clinical trials are warranted to draw final, conclusive findings.

A fatal case of COVID-19 due to metabolic acidosis following dysregulate inflammatory response (cytokine storm)

The ongoing outbreak of COVID-19 has been expanding worldwide. As of 17 April 2020, the death toll stands at a sobering 147,027 and over two million cases, this has been straining the health care systems all over. Respiratory failure has been cited as the major cause of death but here we present a case about a patient who instead succumbed to severe metabolic acidosis with multiple organ failure.

Emerging and neglected zoonoses in transplant population

Zoonoses represent a problem of rising importance in the transplant population. A close relationship and changes between human, animal and environmental health (“One Health” concept) significantly influence the transmission and distribution of zoonotic diseases. The aim of this manuscript is to perform a narrative review of the published literature on emerging and neglected zoonoses in the transplant population. Many reports on donor-derived or naturally acquired (re-)emerging arboviral infections such as dengue, chikungunya, West Nile, tick-borne encephalitis and Zika virus infection have demonstrated atypical or more complicated clinical course in immunocompromised hosts. Hepatitis E virus has emerged as a serious problem after solid organ transplantation (SOT), leading to diverse extrahepatic manifestations and chronic hepatitis with unfavorable outcomes. Some neglected pathogens such as lymphocytic choriomeningitis virus can cause severe infection with multi-organ failure and high mortality. In addition, ehrlichiosis may be more severe with higher case-fatality rates in SOT recipients. Some unusual or severe presentations of borreliosis, anaplasmosis and rickettsioses were also reported among transplant patients. Moreover, toxoplasmosis as infectious complication is a well-recognized zoonosis in this population. Although rabies transmission through SOT transplantation has rarely been reported, it has become a notable problem in some countries. Since the spreading trends of zoonoses are likely to continue, the awareness, recognition and treatment of zoonotic infections among transplant professionals should be imperative.

Genetic diversity of hepatitis E virus (HEV) strains derived from humans, swine and wild boars in Croatia from 2010 to 2017

Background

To fulfill epidemiological data and investigate possible interspecies transmission, this study shall attempt to sequence representative HEV strains of human, swine and wild boar origin collected from 2010 to 2017 in Croatia.

Methods

In total, 174 anti-HEV antibody positive human sera samples; 1419 blood or faeces samples of swine, as well as 720 tissue and/or blood samples of wild boar originating from different counties (18 in total) in Croatia were tested for the presence of HEV RNA.

Results

HEV RNA was detected in 26 human sera samples (14.9%; 95% CI 10.4–21.0%). HEV RNA was detected in 216 tested swine (15.2%; 95% CI 13.5–17.1%), regardless of age, farm breeding system or geographical origin. Viral RNA was also detectable in faeces samples which prove that swine actively participate in shedding HEV into the environment. Of the total of 720 tested wild boar samples, 83 were HEV RNA positive (11.5, 95% CI 9.4–14.1%) originating from six counties. According to the sequence analysis all strains have shown to be members of Orthohepevirus A genotype HEV-3, regardless of host. The genotyping results confirm grouping of sequences into four subtypes of HEV strains of which subtypes 3a and 3c belong to the general cluster 3abchij, and were predominately detected during the study, while subtypes 3e and 3f fall within cluster 3efg. Strains within subtypes 3a and 3e were found in humans, swine and wild boars; subtype 3c strains were derived from humans and swine, whereas subtype 3f strains were found only in humans. Strains belonging to subtypes 3a and 3c were derived during the entire investigated period and may be considered endemic in Croatia, whereas strains within subtypes 3e and 3f were detected sporadically indicating the possibility of newly imported infections.

Conclusions

All detected strains show to be genetically highly related to strains found in humans and/or animals from other European Countries, indicating that trade of live animals or wild boar movement increases the risk of HEV infection spread. Furthermore, homologous strains found in different investigated species within this study indicate interspecies transmission of HEV and/or an existence of an accessible mutual source of infection.

Electronic supplementary material

The online version of this article (10.1186/s12879-019-3906-6) contains supplementary material, which is available to authorized users.

The burden and epidemiology of community-acquired central nervous system infections: a multinational study

Risk assessment of central nervous system (CNS) infection patients is of key importance in predicting likely pathogens. However, data are lacking on the epidemiology globally. We performed a multicenter study to understand the burden of community-acquired CNS (CA-CNS) infections between 2012 and 2014. A total of 2583 patients with CA-CNS infections were included from 37 referral centers in 20 countries. Of these, 477 (18.5%) patients survived with sequelae and 227 (8.8%) died, and 1879 (72.7%) patients were discharged with complete cure. The most frequent infecting pathogens in this study were Streptococcus pneumoniae (n = 206, 8%) and Mycobacterium tuberculosis (n = 152, 5.9%). Varicella zoster virus and Listeria were other common pathogens in the elderly. Although staphylococci and Listeria resulted in frequent infections in immunocompromised patients, cryptococci were leading pathogens in human immunodeficiency virus (HIV)-positive individuals. Among the patients with any proven etiology, 96 (8.9%) patients presented with clinical features of a chronic CNS disease. Neurosyphilis, neurobrucellosis, neuroborreliosis, and CNS tuberculosis had a predilection to present chronic courses. Listeria monocytogenes, Staphylococcus aureus, M. tuberculosis, and S. pneumoniae were the most fatal forms, while sequelae were significantly higher for herpes simplex virus type 1 (p < 0.05 for all). Tackling the high burden of CNS infections globally can only be achieved with effective pneumococcal immunization and strategies to eliminate tuberculosis, and more must be done to improve diagnostic capacity.

First case of imported chikungunya infection in Croatia, 2016

In recent years, several European countries reported cases of imported chikungunya infection. We present the first imported clinically manifested chikungunya fever in Croatia. A 27-year-old woman returned to Croatia on 21 March 2016, after she stayed in Costa Rica for two months where she had noticed a mosquito bite on her left forearm. Five days after the mosquito bite she developed severe arthralgias, fever and erythematous papular rash. In next few days symptoms gradually subsided. After ten days she felt better, but arthralgias re-appeared accompanied with morning stiffness. Two weeks after the onset of the disease she visited the infectious diseases outpatient department. The physical examination revealed rash on the trunk, extremities, palms and soles. Laboratory findings showed slightly elevated liver transaminases. Serological tests performed on day 20 after disease onset showed a high titer of chikungunya virus (CHIKV) IgM and IgG antibodies which indicated CHIKV infection. CHIKV-RNA was not detected. Serology to dengue and Zika virus was negative. The patient was treated with nonsteroid anti-inflammatory drugs and paracetamol. Her symptoms ameliorated, however, three months later she still complaint of arthralgias. The presented case highlights the need for inclusion of CHIKV in the differential diagnosis of arthralgia in all travelers returning from countries with documented CHIKV transmission.

Epidemiology of hepatitis C in Croatia in the European context

We analyzed prevalence, risk factors and hepatitis C virus (HCV) genotype distribution in different population groups in Croatia in the context of HCV epidemiology in Europe, with the aim to gather all existing information on HCV infection in Croatia which will be used to advise upon preventive measures. It is estimated that 35000-45000 of the Croatian population is chronically infected with HCV. Like in other European countries, there have been changes in the HCV epidemiology in Croatia over the past few decades. In some risk groups (polytransfused and hemodialysis patients), a significant decrease in the HCV prevalence was observed after the introduction of routine HCV screening of blood/blood products in 1992. Injecting drug users (IDUs) still represent a group with the highest risk for HCV infection with prevalence ranging from 29% to 65%. Compared to the prevalence in the Croatian general population (0.9%), higher prevalence rates were found in prison populations (8.3%-44%), human immunodeficiency virus-infected patients (15%), persons with high-risk sexual behavior (4.6%) and alcohol abusers (2.4%). Low/very low prevalence was reported in children and adolescents (0.3%) as well as in blood donors (0%-0.009%). In addition, distribution of HCV genotypes has changed due to different routes of transmission. In the general population, genotypes 1 and 3 are most widely distributed (60.4%-79.8% and 12.9%-47.9%, respectively). The similar genotype distribution is found in groups with high-risk sexual behavior. Genotype 3 is predominant in Croatian IDUs (60.5%-83.9%) while in the prison population genotypes 3 and 1 are equally distributed (52.4% and 47.6%). Data on HCV prevalence and risk factors for transmission are useful for implementation of preventive measures and HCV screening.

[TICK-BORNE ENCEPHALITIS VIRUS: EPIDEMIOLOGICAL AND CLINICAL PICTURE, DIAGNOSIS AND PREVENTION]

Tick-borne encephalitis virus (TBEV) is a small, enveloped virus that belongs to the family Flaviviridae, genus Flavivirus, tick-borne encephalitis serocomplex. There are three subtypes of TBEV: European, Far-Eastern and Siberian subtypes, which differ in geographical distribution, tick vector and clinical manifestation of disease in humans. TBEV is endemic in a wide geographic area ranging from Central Europe and the Scandinavian Peninsula to Japan. The virus is maintained in nature in so-called natural foci in cycles involving ticks and wild vertebrate hosts (mainly small rodents). The principal vector for the European subtype is Ixodes (I.) ricinus tick, whereas for Far-Eastern and Siberian subtypes it is I. persulcatus. In the Baltic States and Finland, co-circulation of two or all three subtypes was documented. Several animals, principally small rodents, serve as virus reservoirs. In the tick population, TBEV is transmitted by feeding/co-feed ing on the same host, transovarially (from infected females to their eggs) and trans-stadially (from one development stage to the next). An infected tick remains infected for life. While most TBE infections in humans occur following a tick bite, alimentary routes of TBEV transmission (consumption of unpasteurized milk/milk products from infected livestock) have also been described. All three tick stages can transmit the infection to humans. In the last decade, an increase of TBE incidence has been observed in some endemic areas. This could be due to a number of interacting factors such as changes in the climatic conditions affecting tick habitats, improvements in the quality of epidemiological surveillance systems and diagnostics, in landscape resources and their utilization and more outdoor recreation activity. In addition, the endemic area of TBEV has expanded to higher altitudes (up to 1500 m), apparently influenced by climatic changes. The typical clinical picture of infection with European subtype TBEV is characterized by a biphasic course (50%-77%). The first phase is characterized by nonspecific, flu-like symptoms followed by an asymptomatic interval of about one week. In 20%-30% of persons who develop symptoms, the second phase occurs with symptoms of central nervous system involvement (meningitis, encephalitis, myelitis, radiculitis). The mortality rate for European subtype is 1%-2%. Diagnosis is usually based on detection of specific antibodies (enzyme immunoassay, indirect immunofluorescent assay, plaque reduction neutralization test). From 1993 to 2013, a total of 777 cases of TBE were reported in Croatia. Endemicity is highest in north-western counties (mean incidence 3.61-6.78/100,000 inhabitants). The majority of patients were older than 20 years (88%). Most cases (73%) were reported from May to July.

Hepatitis E in patients with hepatic disorders and HIV-infected patients in Croatia: is one diagnostic method enough for hepatitis E diagnosis?

We assessed hepatitis E virus (HEV) seroprevalence in patients with hepatic disorders as well as in human immunodeficiency virus (HIV)-infected patients and emphasised the issue of possible non-specific anti-HEV seroresponse and need for combining diagnostic methods for hepatitis E diagnosis. Over a two-year period, from March 2011 to February 2013, we determined anti-HEV immunoglobulin M (IgM) and IgG by enzyme immunoassays (EIA; Mikrogen, Germany) in 504 hepatitis patients negative for acute viral hepatitis A-C. Furthermore, 88 samples from randomly selected consecutive HIV-infected patients were also analysed. All EIA reactive samples were additionally tested by line immunoblot assays (LIA; Mikrogen, Germany). HEV nested reverse transcription polymerase chain reaction (RT-PCR) was carried out in 14 anti-HEV IgM LIA-positive patients. Anti-HEV IgM or IgG were detected in 16.9 % of patients by EIA and confirmed by LIA in 10.7 % [95 % confidence interval (CI) 8.3-13.7 %] of hepatitis patients. HEV RNA was detected in five patients. The agreement between EIA and LIA assessed by Cohen's kappa was 0.47 (95 % CI 0.55-0.75) for IgM and 0.83 (95 % CI 0.78-0.93) for IgG. Anti-HEV IgM and IgG seroprevalence in HIV-infected patients was 1.1 %, respectively. Our findings show a rather high HEV seroprevalence in patients with elevated liver enzymes in comparison to HIV-infected patients. Discordant findings by different methods stress the need to combine complementary methods and use a two-tier approach with prudent interpretation of reactive serological results for hepatitis E diagnosis.

Co-infection of Borrelia burgdorferi sensu lato and Rickettsia species in ticks and in an erythema migrans patient

Background

Lyme borreliosis is the most prevalent tick-borne disease in Europe. Ixodes ricinus also carries other pathogenic bacteria, but corresponding human diseases are rarely reported. Here, we compared the exposure to Rickettsia helvetica and Rickettsia monacensis with that to Lyme borreliosis spirochetes. We assumed that their exposure corresponds to their infection rate in questing I. ricinus.

Findings

Three Rickettsia species were detected in ticks with a total prevalence of 7.9%, of which the majority was R. helvetica (78%) and R. monacensis (21%). From the same geographic area, skin biopsies of erythema migrans patients were investigated for possible co-infections with Rickettsia spp.. Forty-seven out of 67 skin biopsies were PCR positive for Borrelia burgdorferi s.l. and one sample was positive for R. monacensis. The Borrelia genospecies from the R. monacensis positive patient was identified as Borrelia afzelii. The patient did not show any symptoms associated with rickettsiosis.

Conclusions

Co-infections of I. ricinus with Rickettsia spp. and B. burgdorferi s.l. were as high as expected from the individual prevalence of both pathogens. Co-infection rate in erythema migrans patients corresponded well with tick infection rates. To our knowledge, this is the first reported co-infection of B. afzelii and R. monacensis.

First outbreak of West Nile virus neuroinvasive disease in humans, Croatia, 2012

Between September 6 and 21, 2012, seven human cases of West Nile virus (WNV) neuroinvasive infection were laboratory confirmed in Croatia. The median patient age was 62 years (range 48-77). Five patients presented with meningoencephalitis and two patients with meningoencephalitis followed by acute flaccid paralysis. Four of them had an underlying disease (hypertension). Using enzyme-linked immunosorbent assay (ELISA), WNV-specific immunoglobulin M (IgM) and IgG antibodies of low avidity were detected in six patients, whereas one showed only IgM antibodies. All samples were confirmed using plaque-reduction neutralization and microneutralization tests. Five patients recovered fully. Before human cases were reported, acute asymptomatic WNV infection was demonstrated by detection of IgM antibodies in sentinel horses. Moreover, an increased WNV IgG seropositivity in horses was detected in counties where human cases occurred. Adulticidal and larvicidal treatments were administered immediately in the respective places of residence. The end of the warm season contributed to the fact that there were no new cases of WNV disease recorded.

Chlamydophila pneumoniae and Mycoplasma pneumoniae were not identified in sinus mucosa of patients with chronic rhinosinusitis

Chronic rhinosinusitis is a symptomatic inflammation of the mucosa of the nose and paranasal sinuses lasting for at least 12 weeks. Atypical bacteria Chlamydophila pneumoniae and Mycoplasma pneumoniae are important causes of human respiratory tract infection. Also, they were identified in bronchial respiratory epithelium of patients with chronic obstructive pulmonary disease or asthma. Having in mind the unified airway concept, it is also possible that these bacteria can cause persistent infection of sinus mucosa in patients with chronic rhinosinusitis. Sixty consecutive patients with chronic rhinosinusitis who underwent the functional endoscopic sinus surgery due to medical therapy failure were included in the study. During the operation, sinuses were irrigated with sterile 0.9% NaCl solution and this lavage was immediately aspirated. Aspirates were used for the detection of C. pneumoniae and M. pneumoniae DNA using real-time PCR. C. pneumoniae and M. pneumoniae DNA were not detected in samples analysed. Atypical bacteria C. pneumoniae and M. pneumoniae did not cause persistent infection of sinus mucosa in patients with chronic rhinosinusitis.

West Nile virus outbreak in humans in Croatia, 2012

During August and September 2012, seven cases of West Nile neuroinvasive disease were identified in three north-eastern counties of Croatia. Four cases were reported in Osijek-Baranja County, two in Brod-Posavina County and one in Vukovar-Srijem County. The median age of the patients was 62.7 years. All patients were hospitalized for 2-5 weeks. The patients from Slavonski Brod had more severe clinical presentation of disease with prolonged hospitalization. Medical entomological research was carried out in 64 localities, where 1785 mosquitoes were captured. Among the analyzed mosquitoes, 114 were determined to be Culex pipiens and subjected to molecular characterization for the presence of virus. No viral RNA was detected in mosquitoes. Subsequent public health measures taken include mosquito control in all settlements where disease was detected.

Ability to cause erythema migrans differs between Borrelia burgdorferi sensu lato isolates

Background

Lyme borreliosis is a tick-borne disease caused by Borrelia burgdorferi sensu lato. The variety of characteristic and non-specific clinical manifestations is partially explained by its genetic diversity. We investigated the ability of B. burgdorferi sl isolates to cause erythema migrans.

Methods

The genetic constellation of isolates from ticks was compared to isolates found in erythema migrans. PCR and sequence analysis was performed on the plasmid-encoded ospC and the chromosomal 5S-23S rDNA spacer region (IGS).

Results

Seven different B. burgdorferi sl genospecies were identified in 152 borrelia isolates from ticks and erythema migrans biopsies. B afzelii (51%) and B. garinii (27%) were the most common in ticks. From the 44 sequences obtained from erythema migrans samples 42 were B. afzelii, one B. garinii and one B. bavariensis. Significant associations with erythema migrans formation were found for four IGS and two ospC types. Five from 45 ospC types were associated with more than one genospecies.

Conclusions

B. burgdorferi sl isolates differ in their propensity to cause erythema migrans. These differences were also found within genospecies. In other words, although B. afzelii was mostly associated with erythema migrans, some B. afzelii isolates had a low ability to cause erythema migrans. Our data further support the occurrence of plasmid exchange between borrelia genospecies under natural conditions.

Bacterial colonization or infection in chronic sinusitis

The aim of this study was the determination of bacteria present in maxillary and ethmoid cavities in patients with chronic sinusitis and to correlate these findings with bacteria simultaneously present in their nasopharynx. The purpose of this correlation was to establish the role of bacteria found in chronically inflamed sinuses and to evaluate if the bacteria present colonized or infected sinus mucosa. Nasopharyngeal and sinus swabs of 65 patients that underwent functional endoscopic sinus surgery were cultivated and at the same time the presence of leukocytes were determined in each swab. The most frequently found bacteria in nasopharynx were Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus spp., Streptococcus viridans and Streptococcus pneumoniae. Maxillary or ethmoidal sinus swabs yielded bacterial growth in 47 (72.31%) patients. The most frequently found bacteria in sinuses were Staphylococcus epidermidis, Staphylococcus aureus, Klebsiella spp. and Streptococci (pneumoniae, viridans and spp.). The insignificant number of leukocytes was present in each sinus and nasopharyngeal swab. Every published microbiology study of chronic sinusitis proved that sinus mucosa were colonized with bacteria and not infected, yet antibiotic therapy was discussed making no difference between infection and colonization. Chronic sinusitis should be considered a chronic inflammatory condition rather than bacterial infection, so routine antibiotic therapy should be avoided. Empiric antibiotic therapy should be prescribed only in cases when the acute exacerbation of chronic sinusitis occurs and the antibiotics prescribed should aim the usual bacteria causing acute sinusitis. In case of therapy failure, antibiotics should be changed having in mind that under certain circumstances any bacteria colonizing sinus mucosa can cause acute exacerbation of chronic sinusitis.

Simultaneous chickenpox and measles infection among migrant children who stayed in Italy during the second half of June 2011

We are reporting on a household outbreak of measles, in which cases of simultaneous measles and chickenpox infection occured in children of a family who resided in Italy during the incubation period (June 2011). In three children, fever and generalized confluent macular rash were the dominant symptoms. Serology testing revealed simultaneous measles and chickenpox infection in four children.

A family outbreak of cryptosporidiosis: Probable nosocomial infection and person-to-person transmission

Cryptosporidium is an important cause of community gastroenteritis, usually associated with drinking contaminated water, visits to swimming pools or animal exposure. In immunocompetent patients, cryptosporidiosis is usually a self-limiting disease but it can be devastating illness in immunocompromised persons. This report presents a family outbreak of cryptosporidiosis and describes a probable nosocomial infection with Cryptosporidium in one patient and subsequent spread of the parasite among members of his family. The index patient, a 72-year-old man with hemiparesis after his third stroke, died after 28 days of persistent diarrhea. Control measures must be undertaken to prevent nosocomial transmission of cryptosporidial oocysts.

[The importance of Streptococcus bovis systemic infections]

Streptococcus bovis is relatively common cause of bacteremia and endocarditis, especially in older persons, or in patients that have some kind of chronic disease. These infections are frequently connected with malignant, potentially malignant, or benign colorectal neoplasia. Hematogenous dissemination of Streptococcus bovis could result with various clinical manifestations, namely purulent meningitis, brain abscess, osteomyelitis, spondylodiscitis, and many different kinds of infections in AIDS patients are reported. In this report, two patients hospitalized at the Departement of Infectious Diseases at the General Hospital "Dr. Josip Bencević" in Slavonski Brod are presented. The first patient was addmited to the hospital because of fever of unknown origin, and in his blood cultures, Streptococcus bovis was isolated. He was an older man, who had undergone prostatectomy due prostatic adenoma several years before. The other patient, previously completely healthy younger man, suffered purulent meningitis caused by the same microorganism. Colon endoscopy was performed in both patients and it revealed colon polyps. Histologically, in both cases, those were benign neoplasia. In Croatia, until this report, there have been no other reports about patients suffering systemic Streptococcus bovis infections. At the same time, this report describes Streptococcus bovis purulent meningitis in a previously healthy adult, which is also extremely rare in the medical literature. Since Streptococcus bovis infections are associated with colon carcinoma, it is imperative to perform colonoscopy in each patient suffering infection with this germ, and to consider him as a high risk patient for developing colon cancer.

[Uveitis caused by Toxocara canis]

The course of disease in a 64-year-old man with toxocariasis and ocular manifestations of the disease, treated at Departments of Ophthalmology and of Infectious Diseases, Dr. Josip Bencević General Hospital in Slavonski Brod, Croatia, is presented. The patient was hospitalized for bilateral uveitis of unknown etiology. In several days, the patient developed high fever with respiratory tract involvement and hepatomegaly. Worsening of the patient's general condition and laboratory findings of leukocytosis and eosinophilia indicated clinical examinations for parasitosis, in consultation with a specialist for infectious diseases. Specific serologic testing pointed to toxocariasis. The patient's general condition and ophthalmologic status improved in response to specific therapy with anthelmintics and corticosteorids. Toxocariasis is an acute infectious disease that primarily affects animals and less frequently humans. Clinically, toxocariasis manifests as a systemic disease, and on the eye as parasitic posterior uveitis. The disease is caused by the nematodes Toxocara canis and Toxocara cati, the species parasitic in the intestine of dogs and cats, respectively. When the parasite eggs reach human intestine, larvae are released and migrate via blood and lymphatic system to the liver, lungs, eyes, and other organs. Considering the mechanism of disease transmission, the potential preventive measures should include treatment and appropriate anthelmintic management of infected animals, and due control of public areas such as public gardens, promenades, playgrounds, along with taking pets for exercise to the sites specially intended for this purpose.

[Streptococcus suis infection, a zoonosis we should have in mind--2 case reports]

Streptococcus suis is primarily pig's pathogen, but can cause disease in a man exposed to contact with pigs (butchers, abatoir workers, farmers). Infection in man is most frequently manifested as purulent meningitis, with deafness and ataxia, but there are rare reports on septic shock with multiple organ failure and death. We report two patients with Streptococcus suis type 1 infection, treated in "Dr Josip Bencević" General Hospital, Slavonski Brod. The first patient suffered a very abrupt and severe illness, with septic shock, multiple organ failure and lethal outcome. The second patient had purulent meningitis with deafness. Both of them had a defect in immunologic function before infection. They were probably infected during manipulation with pork meat at home. Our patients had infection with Streptococcus suis type 1, contrary to reports on prevalent human infection with type 2. It is necessary to make epidemiologic survey on human infection with that pathogen, especially in those professionally exposed to pigs and pork meat.

Streptococcus suis infection as a cause of severe illness: 2 cases from Croatia

Streptococcus suis is a zoonotic agent that can be spread to humans, e.g. butchers, abattoir workers and farmers, by contact with pigs. Human infection is most frequently manifested as purulent meningitis, in combination with deafness and ataxia, but there have been rare reports of septic shock leading to multiorgan failure and death. We report 2 patients with S. suis type 1 infection. One patient suffered an abrupt and severe illness, with septic shock leading to multiorgan failure and death, whereas the other presented with purulent meningitis and deafness. Both patients were immunocompromised. They were most likely infected as a result of handling pork at home. In both cases, the infection was due to S. suis type 1, in contrast to previous reports indicating an association between human infection and S. suis type 2. Epidemiologic surveys of human infection may be of interest, especially among individuals exposed to pigs and pork.

[The biggest epidemic of hemorrhagic fever with renal syndrome in Croatia]

INTRODUCTION

The largest outbreak of hemorrhagic fever with renal syndrome (HFRS) to date occurred in Croatia in the year 2002. The epidemic started in winter, lasted throughout spring to summer months, ending not earlier than November.

AIM

The aim of this study was to investigate and analyze the basic epidemiologic and clinical features of HFRS in Croatia by uniform and standardized prospective-retrospective analysis of all patients affected by the epidemic.

PATIENTS AND METHODS

When the epidemic started, a patient questionnaire with questions on the basic demographic data, site of infection and other epidemiologic characteristics, clinical symptoms, disease severity and laboratory results was designed. Data on 401 patient with a clinical diagnosis of HFRS were collected. The etiologic diagnosis of the disease was confirmed by ELISA, and in some patients by indirect immunofluorescence test (IFT). The results were analyzed using a descriptive statistical method.

RESULTS

HFRS was clinically diagnosed in 401 patients from all over Croatia. A total of 320 (79.8%) cases were reported to the Epidemiology Service of the National Institute of Public Health. The majority of patients (n = 128) were registered in June. Males were three times more affected than females. Apart from its long duration, this epidemic was characteristic for the involvement of general population, with only a small number of the affected from the potential risk groups (forestry workers 28, soldiers 14, farmers 18). The epidemic spread almost throughout inland Coratia. At least 44 patients were infected in the Plitvice Lakes area, 32 in Slunj, 27 on Sljeme, 24 in Velika, and at least 19 in the area of Kutjevo. The youngest patient was aged 4 and the oldest 80 years. The majority of patients were treated in Zagreb (University Hospital for Infectious Diseases--110, Zagreb University Hospital Center--3), followed by Karlovac (71 inpatients and 39 outpatients), Pozega (n = 79), and Rijeka (n = 37). Serologic analysis (ELISA method) detected Puumala virus in 161 and Dobrava virus in only 17 patients. The disease was confirmed by immunofluorescence method in 53 patients (mostly in Kariovac). During the 2002 outbreak, HFRS clinically manifested mostly in a milder form with general symptoms and transitory renal insufficiency, while hemorrhages were rarely recorded. According to our disease severity score, a mild form of the disease was recorded in 65%, moderately severe in 28%, severe in 5% and extremely severe form in 2% of the patients. One patient died. Two thirds of the patients were hospitalized during the febrile stage of the disease. All patients had fever, whereas headache and pain in the lumbar region were recorded in more than 90% of cases, polyuria in 75%, oliguira and vomiting in approximately 50%, respiratory symptoms in 35%, and hemorrhages (mostly on the skin and mucous membranes), vision disturbances, conjunctivitis and diarrhea in approximately 25% of patients. ESR was elevated in 64% and CRP in 93% of patients. Leukocytosis was recorded in 25% and thrombocytopenia in 70% of patients. Increased values of urea and creatinine and signs of liver damage were recorded in approximately 50% of the patients.

CONCLUSION

The largest outbreak of HFRS occurred in Croatia in 2002, with more than 400 diseased throughout Croatia. This epidemic confirmed our previous assumption that the whole Croatia, apart from its narrow coastline area and islands, is a natural focus of HFRS with different causative types of hantaviruses. Efforts should be made to conduct a comprehensive ecologic and mammologic study on hantaviruses and their biologic characteristics in these areas.