Severe Klebsiella infection as a cause of mortality in neonates in Harare, Zimbabwe: evidence from postmortem blood cultures

Types of Bacteria associated with Neonatal Sepsis in Al-Thawra University Hospital, Sana'a, Yemen, and their Antimicrobial Profile

OBJECTIVES

This study was undertaken to investigate the organisms causing sepsis in the Neonatal Unit at Al-Thawra Hospital, Sana'a, Yemen, determine their resistance to antibiotics, and recommend policy for empirical treatment.

METHODS

A total of 158 neonates having one or more signs of sepsis, and aged from 0 to 28 days, were enrolled in this study. A blood sample was taken from each subject, cultured, and then antibacterial susceptibility tests were performed for isolates.

RESULTS

90 (57%) cases yielded positive cultures. Early-onset sepsis showed higher positive culture results (61.7%) than late-onset sepsis (32%). Significant positive culture results were found among the group with birth weight 0.9-2 Kg (78.6%). Gram negative bacteria constituted 97.8% of the total isolates, of which Klebsiella pneumoniae was the predominant pathogen (36.7%), followed by Pseudomonas species (30.0%). The commonest symptoms among the cases were respiratory distress (72.2%), jaundice (62.2%), cyanosis (51.1%), and lethargy (47.8%); the mortality rate was 27.8%. All Gram negative bacterial isolates were sensitive to imipenem and some isolates were sensitive to fourth-generation cephalosporins, but most isolates were highly resistant to the majority of other antibiotics tested.

CONCLUSION

Gram negative organisms were the most frequent causative agents of bacterial sepsis, which is a significant cause of mortality and morbidity in the newborn, and particularly in those of very low birth weight. It can also be concluded that imipenem and fourth-generation cephalosporins can be used for empirical treatment of bacterial sepsis.

Serious community-acquired neonatal infections in rural Southeast Asia (Bohol Island, Philippines)

OBJECTIVE

To determine the bacterial etiology, clinical presentation and risk factors for outcome of serious community-acquired infections in young infants.

STUDY DESIGN

Infants younger than 60 days, admitted for severe pneumonia or suspected sepsis/meningitis were prospectively evaluated using complete blood count, blood culture, chest radiograph, cerebrospinal fluid (CSF) culture in suspected meningitis. chi2 or Fisher's exact test and stepwise logistic regression were used for analysis.

RESULTS

Thirty-four of 767 enrolled infants had a positive blood or CSF culture. Gram-negative bacteria were more frequent than Gram positive: overall (P=0.004), in those below 7 days of age (P=0.002) and among home deliveries (P=0.012). Case fatality rates were higher among infants below 1 week old (OR 4.14, P<0.001), those with dense (OR 2.92, P<0.001) or diffuse radiographic infiltrates (OR 2.79, P=0.003).

CONCLUSIONS

Gram-negative enteric bacteria are the predominant causes of community-acquired infections in Filipino infants below 2 months old. Age below 7 days and radiographic pneumonia predicted death.

Hospital-acquired neonatal infections in developing countries

Hospital-born babies in developing countries are at increased risk of neonatal infections because of poor intrapartum and postnatal infection-control practices. We reviewed data from developing countries on rates of neonatal infections among hospital-born babies, range of pathogens, antimicrobial resistance, and infection-control interventions. Reported rates of neonatal infections were 3-20 times higher than those reported for hospital-born babies in industrialised countries. Klebsiella pneumoniae, other gram-negative rods (Escherichia coli, Pseudomonas spp, Acinetobacter spp), and Staphylococcus aureus were the major pathogens among 11,471 bloodstream isolates reported. These infections can often present soon after birth. About 70% would not be covered by an empiric regimen of ampicillin and gentamicin, and many might be untreatable in resource-constrained environments. The associated morbidity, mortality, costs, and adverse effect on future health-seeking behaviour by communities pose barriers to improvement of neonatal outcomes in developing countries. Low-cost, "bundled" interventions using systems quality improvement approaches for improved infection control are possible, but should be supported by evidence in developing country settings.

Serious bacterial infections in newborn infants in developing countries

PURPOSE OF REVIEW

The overwhelming majority of the world's annual 4 million neonatal deaths occur in developing countries. This review therefore briefly addresses the burden, aetiology, prevention and management of serious neonatal bacterial infections in low-income settings.

RECENT FINDINGS

Bacterial infection is the biggest cause of neonatal admissions to hospitals, and probably the biggest cause of morbidity in the community, but its burden is unclear. The commonest serious infections involve bacteraemia, meningitis and respiratory infection, and case fatality rates may be as high as 45%. Key pathogens are Escherichia coli, Klebsiella species, Staphylococcus aureus and Streptococcus pyogenes. The incidence of neonatal infections with group B streptococcus is highly variable, as is the spectrum of antimicrobial resistance.

SUMMARY

Current areas of research include the rectification of micronutrient deficiencies, neonatal skin care, appropriate breastfeeding recommendations, cleansing of the birth canal, and simplified methods of diagnosis of infection. Operational activities include the control of neonatal tetanus, the diagnosis and treatment of sexually transmitted infections, integrated strategies for improving pregnancy, childbirth and neonatal survival, community-based management of acute respiratory infections, and community-based management of neonatal sepsis.

Late onset infection in very low birth weight infants in Malaysian Level 3 neonatal nurseries. Malaysian Very Low Birth Weight Study Group

BACKGROUND

The purpose of this study was to examine the rate and mortality from late onset infection occurring in very low birth weight infants admitted to Malaysian nurseries.

METHODS

Data on all infants 1500 g or below admitted to the 20 participating Level 3 nurseries were analyzed for late onset infection (clinical infection and positive blood or cerebrospinal fluid culture occurring after 48 h of life).

RESULTS

The overall survival of the 962 study infants was 69%. The rate of late onset infection was 19.3%. The mortality in those with late onset infection was 30.8%. The most common infecting organism was Klebsiella pneumoniae, accounting for 38.3% of infections and 46.9% of deaths in infants with infection, followed by coagulase-negative staphylocci, 17.6 and 12.2%, respectively. On logistic regression analysis risk factors for late onset gram-negative compared with gram-positive infection were endotracheal intubation at birth and blood transfusion. Hypoglycemia was associated with gram-positive infection.

CONCLUSION

The late onset infection rate in Malaysian very low birth weight infants does not differ from that reported from developed countries, but the mortality is higher. This could be because of an excess of gram-negative infections.

Community-acquired bacteremia in human immunodeficiency virus-infected children in Harare, Zimbabwe

BACKGROUND

HIV infection is common in mothers and their children in Zimbabwe, and HIV-infected children are particularly susceptible to bacterial infections. There is little information on the etiology and outcome of HIV-related bacteremia in African children.

METHODS

Blood cultures from 309 hospitalized children in Zimbabwe, of whom 168 were diagnosed as having HIV, were examined for pathogens. The association among significant bacteremia, HIV infection and mortality was assessed in these children.

RESULTS

The most common isolates were coagulase-negative staphylococci (31 children, 25 clinically significant), Staphylococcus aureus (22 children) and Streptococcus pneumoniae (20 children). Nontyphoidal Salmonella (10 children), Escherichia coli (4 children) and Klebsiella sp. (4 children) were the most frequent Gram-negative bacteria. Two children had Rhodococcus equi pneumonia. HIV-infected children showed increased risk of bacteremia (odds ratio (OR) = 2.68), especially if younger than 18 months of age (OR = 2.94), and high risk of enterobacteremia (OR = 15.76). There was no significant association of bacteremia with nutritional status. Mortality was 17% overall but was higher in HIV-infected children up to 6 months of age (OR = 2.81) and in bacteremic children of any age (OR = 2.03).

CONCLUSIONS

Prompt recognition of pathogens and early administration of appropriate antimicrobials is important in reducing the morbidity and mortality associated with bacteremia in HIV-infected children in Africa.

Enterobacter sepsis in the newborn--a growing problem in Karachi

Enterobacter sepsis is commonly recognized as a hospital-acquired infection in childhood. In a five year prospective surveillance of neonatal sepsis at the Aga Khan University Hospital in Karachi, we identified Enterobacter sepsis in 28/292 (10%) cases, with an incidence of 0.7 per thousand births among inborn infants. There was no significant difference in predisposing factors and clinical features between Enterobacter and other infections. Approximately half (47%) of Enterobacter infections presented within 72 h of birth and the associated mortality was 21%. Increasing resistance to commonly used first- and second-line antibiotics over the last five years was noted. Enterobacter infections are emerging as significant pathogens among cases of neonatal sepsis in Karachi.

The changing face of neonatal septicaemia

A prospective study was undertaken over a 1-year period in northern Jordan to determine the incidence, causes and characteristics of neonatal septicaemia which is a major cause of mortality and morbidity in newborns. The study identified 47 septicaemic neonates, representing an incidence of 2.3/1000 live births. Respiratory distress and hyperbilirubinaemia were the prominent presenting clinical findings. Gram-negative organisms were cultured from 46 neonates with Klebsiella species, accounting for 64% of cases. There were no cases of infection with group B Streptococcus or Listeria monocytogenes. The overall mortality rate was 40%. Prematurity and low birthweight, early onset septicaemia and concomitant meningitis were associated with high mortality. The high incidence of Gram-negative septicaemia and the antibiotic sensitivity pattern of the organisms indicated the use of cefotaxime or ceftazidime as initial therapy while awaiting culture results. Continued surveillance of neonatal septicaemia is mandatory due to temporal changes in the causative organisms and their antibiotic sensitivity.