The incidence of oral herpes simplex virus infection in patients undergoing cancer chemotherapy

Antiviral Agents for the Prevention and Treatment of Herpes Simplex Virus Type-1 Infection in Clinical Oncology: A Network Meta-Analysis

Cancer therapy may be complicated and compromised by viral infections, including oral herpes simplex virus (HSV) infection. This network meta-analysis aimed to identify the best antiviral agent to prevent or treat oral HSV infection in patients being treated for cancer. A search was conducted for trials published since inception until the 10th of May 2020 in MEDLINE, EMBASE and the Cochrane Central Register of Controlled Trials. A network meta-analysis was performed on the data from randomized controlled trials that assessed antiviral agents for preventive or therapeutic activity vs. placebo, no treatment or any other active intervention in patients being treated for cancer. The agents were ranked according to their effectiveness in the prevention of oral HSV using surface under the cumulative ranking (SUCRA). Grading of Recommendations, Assessment, Development and Evaluations (GRADE) was used to assess the certainty of the evidence. In total, 16 articles were included. The pooled relative risk (RR) to develop oral HSV infection in the acyclovir group was 0.17 (95% CI: 0.10, 0.30), compared to 0.22 (95% CI: 0.06, 0.77) in the valacyclovir group. Acyclovir ranked highest for the prevention of oral HSV followed by valacyclovir. Subgroup analysis with different acyclovir regimens revealed that the best regimens in terms of HSV-1 prevention were 750 mg/m2 acyclovir administered intravenously followed by 1600 mg per day orally. Acyclovir (250 mg/m2 per day) administered intravenously was the least effective against the prevention of oral HSV.

Seroprevalence of HSV-1/2 and correlation with aggravation of oral mucositis in patients with squamous cell carcinoma of the head and neck region submitted to antineoplastic treatment

PURPOSE

Oral mucositis (OM) is a frequent side effect resulting from antineoplastic treatment and is described as an acute alteration characterized by ulcerative lesions, with the presence of a persistent chronic inflammatory infiltrate, erythema, and pain.

AIMS

The purpose of the study was to evaluate the presence of the herpes simplex virus (HSV-1/2) in patients with squamous cell carcinoma of the head and neck region (SCC) and its influence on the aggravation of oral mucositis after radiotherapy or radio/chemotherapy treatment.

METHODS

In this prospective cohort study, 91 patients were evaluated with regard to their serological status for IgG before treatment (initial time interval--TI) and for IgM before treatment (T1) and on the 30th day after the first day of radiotherapy application/radiation therapy (final time interval--TF), using immunoenzymatic assay (ELISA), and the results were correlated with the intensity of OM.

RESULTS

The seroprevalence for IgG was 97.8 %. IgM (TI) was positive in 18.7% and IgM (TF) in 20.9% of patients. All the patients developed some degree of oral mucositis; however, there was statistically significant correlation between positivity for IgM and degree of severity of OM, irrespective of the type of treatment to which the patient was submitted.

CONCLUSION

The reactivation of HSV-1/2 was shown to be relatively infrequent and there was no correlation between presence of the virus and aggravation of oral mucositis resulting from antineoplastic treatment.

Oral complications and management strategies for patients undergoing cancer therapy

With cancer survival rate climbing up over the past three decades, quality of life for cancer patients has become an issue of major concern. Oral health plays an important part in one's overall quality of life. However, oral health status can be severely hampered by side effects of cancer therapies including surgery, chemotherapy, radiotherapy, and hematopoietic stem cell transplantation. Moreover, prevention and treatment of these complications are often overlooked in clinical practice. The present paper aims at drawing health care professionals' attention to oral complications associated with cancer therapy by giving a comprehensive review. Brief comments on contemporary cancer therapies will be given first, followed by detailed description of oral complications associated with cancer therapy. Finally, a summary of preventive strategies and treatment options for common oral complications including oral mucositis, oral infections, xerostomia, and dysgeusia will be given.

The roles of viruses in brain tumor initiation and oncomodulation

While some avian retroviruses have been shown to induce gliomas in animal models, human herpesviruses, specifically, the most extensively studied cytomegalovirus, and the much less studied roseolovirus HHV-6, and Herpes simplex viruses 1 and 2, currently attract more and more attention as possible contributing or initiating factors in the development of human brain tumors. The aim of this review is to summarize and highlight the most provoking findings indicating a potential causative link between brain tumors, specifically malignant gliomas, and viruses in the context of the concepts of viral oncomodulation and the tumor stem cell origin.

A systematic review of viral infections associated with oral involvement in cancer patients: a spotlight on Herpesviridea

PURPOSE

Our aim was to evaluate the literature for the prevalence of and interventions for oral viral infections and, based on scientific evidence, point to effective treatment protocols. Quality of life (QOL) and economic impact were assessed if available in the articles reviewed.

METHODS

Our search of the English literature focused on oral viral infections in cancer patients within the timeframe of 1989-2007. Review methods were standardized. Cohort studies were used to determine the weighted prevalence of oral viral infection in cancer patients. The quality of selected articles were assessed and scored with respect to sources of bias, representativeness, scale validity, and sample size. Interventional studies were utilized to determine management guidelines. Literature search included measures of QOL and economic variables.

RESULTS

Prevalence of oral herpes simplex virus (HSV) infection in neutropenic patients was higher than in patients treated with radiotherapy for head and neck cancer (49.8% vs. 0%, respectively). In patients treated with radiochemotherapy for head and neck cancer, the prevalence of oral HSV infection increases up to 43.2% (CI, 0-100%). Prevalence of HSV infection was higher when oral ulcers existed. Information about other oral viral infections is sparse. There was a significant benefit of using acyclovir to prevent HSV oral infection (at 800 mg/day). Various dosing protocols of valacyclovir achieved prevention of HSV reactivation (500 or 1,000 mg/day). The prevalence of HSV reactivation was similar for acyclovir and valacyclovir. No information about impact on QOL and economic burden was available.

CONCLUSIONS

Acyclovir and valacyclovir are equally effective in preventing oral HSV infection. Neutropenic patients, who were primarily treated for hematological malignancies in the studies reviewed, are at a greater risk for viral infection.

Assessment of oral cytological changes associated with exposure to chemotherapy and/or radiotherapy

BACKGROUND

Death from cancer is high in Sudan, with low survival rates, as most of the patients present with advanced disease. Most patients receive high and repeated doses of radiotherapy or chemotherapy. The aim of this study was to investigate the feasibility of using cytological evaluation to detect oral epithelial atypia amongst these patients. As a part of the continuous development in cancer therapy, this case control study was conducted in Khartoum, Sudan.

METHODS

Papanicolaou stained oral mucosal cells were obtained from 100 cancer patients receiving radiotherapy and/or chemotherapy (ascertained as cases), 50 cancer patients not exposed to either therapy (control 1), and 50 apparently healthy individuals (control 2).

STATISTICAL ANALYSIS

The data was analyzed by using a computer SPSS program, to obtain the Chi-square test.

RESULTS

Without prior knowledge of the subjects' group, oral epithelial atypia was detected in 7% of the cases. Inconclusive features of cytological atypia were observed in 13% of the cases. Atypia was not observed in both the control groups. Inflammatory infiltrate and viral cytopathic effects were identified in 32% and 8% of the cases respectively.

CONCLUSION

Cytological atypia, viral infections, and inflammatory infiltrates were detected after exposure to radiotherapy and/or chemotherapy.

Herpes Simplex Virus Type 1 infection: overview on relevant clinico-pathological features

Herpes Simplex Virus Type 1 (HSV-1) is a nuclear replicating enveloped virus, usually acquired through direct contact with infected lesions or body fluids (typically saliva). The prevalence of HSV-1 infection increases progressively from childhood, the seroprevalence being inversely related to socioeconomic background. Primary HSV-1 infections in children are either asymptomatic or following an incubation period of about 1 week gives rise to mucocutaneous vesicular eruptions. Herpetic gingivostomatitis typically affects the tongue, lips, gingival, buccal mucosa and the hard and soft palate. Most primary oro-facial HSV infection is caused by HSV-1, infection by HSV-2 is increasingly common. Recurrent infections, which occur at variable intervals, typically give rise to vesiculo-ulcerative lesions at mucocutaneous junctions particularly the lips (herpes labialis). Recurrent HSV-1 infection within the mouth is uncommon in otherwise healthy patients, although in immunocompromised patients, recurrent infection can be more extensive and/or aggressive. The diagnosis of common herpetic infection can usually be based upon the clinical history and presenting features. Confirmatory laboratory diagnosis is, however, required when patients are, or may be, immunocompromised.

Management of recurrent oral herpes simplex infections

The literature has been reviewed for evidence of the efficacy of antiviral agents in both the prophylaxis and treatment of recurrent oral herpes simplex virus (HSV) infections and discussed by a panel of experts. Emphasis was given to randomized controlled trials. Management of herpes-associated erythema multiforme and Bell palsy were also considered. The evidence suggests that 5% acyclovir (ACV) in the cream base may reduce the duration of lesions if applied early. Recurrent herpes labialis (RHL) and recurrent intraoral HSV infections can be effectively treated with systemic ACV 400 mg 3 times a day or systemic valacyclovir 500 to 1000 mg twice a day for 3 to 5 days (longer in the immunocompromised). RHL in the immunocompetent can be effectively prevented with (1) sunscreen alone (SPF 15 or above), (2) systemic ACV 400 mg 2 to 3 times a day, or (3) systemic valacyclovir 500 to 2000 mg twice a day. Valacyclovir 500 mg twice a day is also effective in suppressing erythema multiforme triggered by HSV. Further studies are needed to compare treatment efficacy between topical penciclovir, docosanol, and ACV cream for RHL.

Oral and perioral herpes simplex virus type 1 (HSV-1) infection: review of its management

Herpes simplex virus type 1 (HSV-1) gives rise to a variety of clinical disorders and is a major cause of morbidity and mortality worldwide. HSV-1 infections are common in oral and perioral area. The aim of the present report was to critically examine the published literature to evaluate the advantages and limitations of therapy of HSV-1 infection in both immunocompetent and immunocompromised patients. Systemic antiviral therapy has been widely accepted as effective for primary herpetic gingivostomatitis. Aciclovir (ACV) 5% cream seems to be the accepted standard topical therapy for herpes labialis, being both effective and well tolerated, although penciclovir 1% cream has been proposed as a potentially useful treatment. Systemic ACV may be effective in reducing the duration of symptoms of recurrent HSV-1 infection, but the optimal timing and dose of the treatment are uncertain. Aciclovir and famciclovir may be of benefit in the acute treatment of severe HSV-1 disease in immunocompromised patients. There is also evidence that prophylactic oral ACV may reduce the frequency and severity of recurrent attack of herpetic infection in immunocompromised patients, but the optimal timing and duration of treatment is uncertain and can vary in different situations.

Management of acyclovir-resistant herpes simplex virus

In immunocompetent patients, HSV is controlled rapidly by the human host's immune system, and recurrent lesions are small and short lived. When treated with antiviral agents, these patients rarely develop resistance to these drugs. In contrast immunocompromised patients might not be able to control HSV infection. Thus, frequent and severe reactivations are often seen and might lead to fatal herpetic encephalitis or disseminated HSV infection. Treatment in these patients is limited because immunocompromised hosts often develop severe herpes disease refractory to antiviral drug therapy. It is therefore imperative that physicians develop regimens to deal with both receptive and refractory HSV disease. The following treatment protocol (modified from Balfour and colleagues) might serve as a guide until further investigation of new drugs is performed. In all patients standard oral ACV therapy should be initiated at a dose of 200 mg orally, five times a day for the first 3 to 5 days. Prior to treatment, cultures the lesions should be obtained to verify HSV etiology. If the response is poor, the dose of oral ACV should be increased to 800 mg five times a day. If no response seen after 5 to 7 days, it is unlikely that the lesion will respond to intravenous ACV (or chemically and structurally related drugs such as VCV or famciclovir), so an alternative regimen must be assigned. First, repeat cultures for vital, fungal, and bacterial pathogens must be performed. In addition, ACV susceptibility studies should be ordered, if available. If the mucocutaneous lesion is accessible for topical treatment, TFT (as ophthalmic solution) should be applied to the area three to four times a day until the lesion is completely healed. If the lesion is inaccessible or if the response to TFT is poor, therapy with intravenous foscarnet should be given for 10 days or until complete resolution of the lesions. The dosage of foscarnet should be 40 milligrams per kilogram three times per day or 60 milligrams per kilogram twice daily. If foscarnet fails to achieve clinical clearing, consideration should be given to use of intravenous cidofovir (or application of compounded 1% to 3% topical cidofovir ointment). Vidarabine is reserved for situations in which all of these therapies fail. If lesions reoccur in the same location following clearing, the patient should started on high-dose oral ACV (800 mg, five times daily) or intravenous foscarnet (40 mg/kg tid or 60 mg/kg bid) as soon as possible. When lesions occur in a different location, the patient should be treated initially with standard doses of oral ACV (200 mg, five times daily) and the above protocol should be followed should there be clinical failure. In the future, new treatment options for patients with documented HSV resistance will be important in reducing the clinical impact of HSV.

Oral recurrent human herpes virus infection and bone marrow transplantation survival

OBJECTIVE

This study was conducted to compare the survival rates of bone marrow transplantation (BMT) patients who were affected with the survival rates of those who were not affected by oral recrudescent human herpes virus-1 infection (HHV-1) after transplantation.

STUDY DESIGN

Fifty-two consecutive patients who underwent BMT were included in the study. The time of death after BMT was displayed, by means of the Kaplan-Meier method, for the following parameters: age and gender of the patient, donor gender, primary disease, stem cells, conditioning regimen, platelet number after day 100, acute and chronic graft-versus-host disease, oral recurrent HHV-1 infection post-BMT, oral lichenoid lesions of graft-versus-host disease, graft-versus-host disease at the salivary glands, parenteral nutrition, and oral mucositis. The data were initially analyzed by means of the log-rank test and then included in the Cox proportional hazards model.

RESULTS

The multivariate analysis demonstrated a significance of 5% for only the platelet numbers and oral recurrent HHV-1 infection.

CONCLUSION

The present study provides evidence that platelet numbers below 100,000 cells/mm(3) after day 100 and oral recurrent HHV-1 infection are independent negative prognostic variables in BMT patients' 24-month survival rates.

Complicating mucosal reactions in patients receiving radiation therapy for head and neck cancer

Radiation mucositis is characterized by erythema, pseudomembranes, and ulceration of mucosa in the irradiated field. We present two cases of oral mucosal changes in patients treated with radiotherapy in the head and neck region, which included mucosal erythema and ulceration outside of the radiated fields. One case was confirmed as herpes virus infection, and the other was diagnosed as Sweet's syndrome. When mucositis extends beyond the radiation fields, the clinician should consider other causes of mucosal inflammation and erythema in order to begin appropriate management.

Oral recrudescent herpes simplex virus infection

OBJECTIVE

The objective of this study is to determine the frequency of involvement of different intraoral sites by oral recrudescent herpes simplex virus in immunocompromised patients and whether keratinized intraoral sites are always affected by this virus.

STUDY DESIGN

The records of 30 hospitalized patients who had oral ulcers culture positive for herpes simplex virus were reviewed for the location of oral ulcers, febrile episodes, and medical diagnoses.

RESULTS

The data revealed that oral recrudescent herpes simplex virus may involve any intraoral site in immunocompromised patients with nonkeratinized sites representing approximately half of all sites; this is more frequent than has been previously reported. Twenty-six (86.7%) of 30 patients had no evidence of herpes labialis, and 13 (43.3%) of 30 patients were afebrile.

CONCLUSION

It is recommended that all oral ulcers, in immunocompromised patients should be cultured for herpes simplex virus regardless of their location. Early diagnosis reduces patient morbidity because effective treatment in the form of acyclovir is readily available.

Mucositis management practices for hospitalized patients: national survey results

The optimal management strategies for cancer chemotherapy and radiotherapy-induced mucositis have not been identified. In 1989, the National Institutes of Health (NIH) published a consensus statement outlining a standardized approach for the prevention and treatment of oral complications. The purpose of this survey was to identify the national treatment practices for oral mucositis, mucocutaneous Herpes simplex virus infections, and oral candidiasis, and to compare them to the NIH guidelines. Surveys were mailed to clinical pharmacists at 200 hospitals throughout the United States. Sixty-two of the 200 questionnaires were completed and returned. Institutions used a diversity of agents, generating substantial variability in mucositis prophylaxis and treatment protocols. Many of these therapies included products or combinations of ingredients that lack proven clinical efficacy. Mucositis management strategies for hospitalized patients vary widely at US hospitals. Coordinated, controlled studies are needed to identify optimal therapies for these patients.

Management of orofacial pain in cancer patients

Pain in patients with cancer may arise due to the primary disease, or due to therapy of the malignant disease. Pain may be caused by oral infection, oral mucositis, and by alteration in musculoskeletal and neurological function. The management of orofacial and oropharyngeal pain in patients with cancer is reviewed in this paper.

Concurrent oral cytomegalovirus and herpes simplex virus infection in association with HIV infection. A case report

Recurrent oral herpes simplex virus lesions are common in both immunocompetent and immunocompromised persons. In contrast, cytomegalovirus-associated intraoral lesions are rarely seen, even in the immunocompromised host. We report a case of concurrent oral herpes simplex virus and cytomegalovirus infection, appearing as an ulcerative lesion of the labial mucosa in a patient with acquired immunodeficiency syndrome. Herpes simplex virus type 1 was shown to be present in the lesion by culture tests, histopathologic examination, immunohistochemistry findings and a direct immunofluorescence assay, and cytomegalovirus by histopathologic examination and immunohistochemistry findings. We deduce that the lesion was due to concurrent herpes simplex virus-1 and cytomegalovirus infection. The patient responded well to 2 weeks of treatment with a high dose of acyclovir.

Orofacial complications of chemotherapy for breast cancer

The National Institutes of Health recently recommended research initiatives to investigate oral complications of cancer chemotherapy. This prospective cohort study investigated orofacial complications of combination chemotherapy (cyclophosphamide, methotrexate, fluorouracil, vincristine, and prednisone) in women with breast cancer. Thirty-four patients were given baseline interviews and examinations. Each patient was given weekly orofacial examinations and biweekly interviews for the first seven cycles of cytotoxic treatment. The orofacial complications included neurotoxicity caused by vincristine, mucositis, and candidiasis. Neurotoxicity affected 22 of 34 (65%) patients, was significantly associated with age less than 50 years (p less than 0.05), and manifested as pain in 19 of 34 (56%) patients. Mucositis affected 7 of 34 (21%) patients and was significantly associated with the occurrence of lesions of the oral mucosa at baseline examination; and smaller body surface area--indicating a dose-related toxicity (p less than 0.05). In four of the patients with mucositis (57%) granulocytopenia developed during the 7 days after the onset of mucositis. Intraoral candidiasis affected 4 of 34 (12%) patients.

Treatment and prophylaxis of chemotherapy-induced gastrointestinal complaints

Ninety-eight patients (48 male, 50 female; age median, 56 years; range, 25-85 years) with solid tumors (21 breast cancers, 6 sarcomas, 2 colorectal cancers, 1 pancreatic carcinoma, 1 hypernephroma, and 1 lung cancer) and hematologic neoplasms (24 multiple myelomas, 32 lymphomas, and 10 myeloproliferative syndromes) were recruited into the study. The patients received at least three cycles of chemotherapy with alkylating substances, anthracyclines, antimetabolites, and vinca alkaloids, with or without corticosteroids. A total of 325 cycles of chemotherapy were administered. The symptoms were evaluated by means of a score system on the basis of which heartburn, sensation of repletion, nausea, and cramps were assessed by incidence and degree of severity. Before initiation of concomitant therapy with sucralfate, 47 patients (48%) had symptoms during chemotherapy (heartburn, sensation of repletion, nausea, cramps). After initiation of therapy with sucralfate these symptoms improved in 42 patients (89%); in 6 patients there was a transitory increase in heartburn and nausea. All other patients remained without symptoms in spite of chemotherapy. The evaluation of the patient population as a whole showed a significant decrease of chemotherapy-induced heartburn (p less than 0.01) and nausea (p less than 0.01) during sucralfate therapy. This was tolerated extremely well; side effects were not observed. To summarize, this prospective clinical study shows that sucralfate is an effective and suitable therapeutic principle in long-term therapy for the treatment and prophylaxis of chemotherapy-induced gastrointestinal complaints.

Herpes simplex virus in immunocompromised patients: growing evidence of drug resistance

Antiviral drugs have proven effective in treatment of herpesvirus infections and in prevention of reactivation of latent virus. The prototype drug is acyclovir. Herpes simplex virus (HSV) is susceptible to acyclovir. There is increasing evidence in immunocompromised patients of acyclovir-resistant HSV causing clinical disease. Mechanisms of HSV resistance to acyclovir are known. These findings have implications for the future development and clinical use of antiviral drugs.

The role of herpes simplex virus in the development of oral mucositis in bone marrow transplant recipients

Herpes simplex virus (HSV) has been implicated as a major etiologic factor in the development of ulcerative mucositis in bone marrow transplant (BMT) recipients. In this study, 60 patients who received BMTs were evaluated for at least 30 days post-transplant for ulcerative mucositis and the presence of culturable HSV. Fifty-nine patients received prophylactic acyclovir. Forty-six patients developed ulcerative lesions and 45 of these were culture negative for HSV. Neither the source of transplant (autologous versus allogenic) nor the HSV antibody status of the patient affected the frequency of mucositis. The conditioning regimen appeared to be the most significant factor contributing to the severity of ulcerative mucositis. While the majority of ulcers occurred on movable nonkeratinized mucosa in BMT recipients, the usual sites of reactivation of intraoral HSV are nonmovable, keratinized mucosa. We conclude that HSV is probably not a major etiologic agent of mucositis in BMT recipients and that acyclovir is an effective agent in preventing HSV reactivation.

Oral herpes simplex virus infection with cardiac transplantation

Oral herpes simplex virus infection is a common complication of cardiac transplantation. Lesions are secondary to reactivation of the virus, are atypical in appearance, and can involve any oral and perioral surface. Diagnosis on clinical grounds is difficult and should be confirmed with laboratory testing. A case report and review of the literature are presented to support the features of this infection.

Oral and pharyngeal herpes simplex virus infection after allogeneic bone marrow transplantation: analysis of factors associated with infection

This study analyzed factors associated with acute oropharyngeal herpes simplex virus (HSV) infection in 627 patients who had undergone allogeneic bone marrow transplantation for leukemia, lymphoma, or aplastic anemia. HSV infection developed in 233 (37%) of the patients; all but two were seropositive for HSV before transplant. Sixty-two percent of the seropositive patients had at least one episode of HSV reactivation during the first 100 days after transplant. Other factors that placed patients at increased risk for HSV infection were a pretransplant diagnosis of leukemia, being in remission at the time of transplant, and/or having been conditioned for transplant with chemoradiotherapy. Recognition of factors that may predispose patients to HSV infection helps determine those transplant recipients who might benefit most from antiviral prophylaxis or other approaches to prevention of HSV reactivation.

Clinical study of herpes simplex virus infection in leukemia

Twenty-nine patients with leukemia were observed for the development of and recovery from oral herpes simplex virus (HSV) lesions. In patients with seropositive test results, lymphocyte and monocyte counts may provide a guide to predict the onset of HSV infections and to indicate when to institute acyclovir prophylaxis. When HSV developed, acyclovir was effective in preventing progression of the lesions, which did not resolve until white cell counts had recovered.

Herpes simplex virus and intraoral ulcers in immunocompromised patients with haematologic malignancies

Possible factors predisposing to the development of intraoral ulcers in immunocompromised patients with haematologic malignancies were investigated. Among 46 patients undergoing antineoplastic treatment, 18 developed an intraoral ulcer during the prospective study. Patients with or without ulcers were comparable with respect to underlying disease, presence of teeth, the qualitative composition of the aerobic and facultatively anaerobic oral microflora, herpes simplex virus (HSV) titer positivity, a past history of herpes labialis, leukocyte and thrombocyte counts, and duration of fever. Viral cultures from saliva revealed an association between the presence of HSV in saliva and the presence of intraoral ulcers. HSV was not isolated from the saliva of any patient without ulcers. Viral cultures from the ulcers revealed growth of HSV in 11 (61%) of the 18 patients with ulcers. HSV-positive ulcers were located more often on the alveolar process than elsewhere in the oral cavity. Ulcers on the lateral borders of the tongue and on the buccal mucosa were found only in dentate patients. Development of intraoral ulcers was not associated with an increase of the HSV titer in serum in any patient. It is concluded that some intraoral ulcers, especially when located on the alveolar process, are associated with and probably caused by HSV, while mechanical trauma during mastication seems likely to be involved in the pathogenesis of ulcers elsewhere in the oral cavity.

Orofacial herpes simplex virus infections: current concepts in the epidemiology, pathogenesis, and treatment, and disorders in which the virus may be implicated

Herpes simplex virus (HSV) is the causal agent of herpetic stomatitis, recurrent herpes labialis, and the recurrent intraoral infections seen particularly in the immunocompromised patient. HSV has also been implicated in some erythema multiforme, cranial neuropathies, Behçet's syndrome, and oral squamous carcinoma. Recent advances in understanding of HSV, epidemiology, pathogenesis, and treatment are reviewed because there have been numerous advances over the past 5 years.

EBV and HSV infections in a patient who had undergone bone marrow transplantation: oral manifestations and diagnosis by in situ nucleic acid hybridization

The course of infections with herpes simplex virus and Epstein-Barr virus in an immunosuppressed patient who had undergone bone marrow transplantation and had tested seronegative for human immunodeficiency virus is described. The clinical oral manifestations were unusual, as they included hairy leukoplakia-like lesions and extensive mucosal ulceration. Histologic examination disclosed unique features consisting of both lichenoid and viral cytopathic changes. The association of the lesions with both Epstein-Barr virus and herpes simplex virus was confirmed by in situ hybridization histochemistry. The importance of recognition of the symptoms, specific diagnosis by DNA hybridization, and implications for antiviral prophylaxis and therapy are emphasized.

Acyclovir prophylaxis for oral herpes simplex virus infection in patients with bone marrow transplants

Reactivation of herpes simplex virus (HSV) appears to play a significant role in oral mucositis resulting from bone marrow transplantation. The acyclic guanosine derivative acyclovir has been shown to be effective in treating and protecting against HSV infection in this group. The purpose of this study was to determine the role of HSV reactivation in oral mucositis in patients undergoing bone marrow transplantation who were seronegative for HSV or who received acyclovir prophylaxis. The results suggest that HSV plays an insignificant role in oral mucositis in these patients.

Acyclovir-resistant, foscarnet-sensitive oral herpes simplex type 2 lesion in a patient with AIDS

We report the case of an immunocompromised patient with AIDS in whom developed a perioral and several intraoral HSV 2 lesions that persisted for more than 1 year. The virus was resistant to acyclovir but was sensitive to foscarnet. Viral isolates were thymidine kinase negative. The lesions resolved with intravenous foscarnet therapy given over a 15-week period, and when last seen, 8 months after foscarnet was discontinued, the patient had not had a recurrence.

The role of an immunoperoxidase technique in the diagnosis of oral herpes simplex virus infection in patients with leukemia

Laboratory techniques are often used to confirm a clinical diagnosis of oral herpes simplex virus (HSV) infection in patients with leukemia. In the present study, an immunoperoxidase technique (IPT) was used to examine smears taken from the oral mucosa of 44 patients with leukemia at Vancouver General Hospital. It was found that the IPT was as sensitive and specific as viral culture in confirming the presence of HSV. The IPT was found to be more predictive of symptomatic oral HSV disease than viral culture because it did not give positive results if there was only viral shedding in the absence of clinical disease. As the IPT is rapid and inexpensive as well as being specific, sensitive, and predictive, it has a definite role in the laboratory confirmation of oral HSV lesions in leukemics.

Oral herpes simplex infections in patients with leukemia

Thirty patients hospitalized for induction chemotherapy of acute leukemia were studied for incidence, severity, and clinical features of oral herpes simplex virus infections. In 50% of the patients with evidence of past herpes infection, recurrent oral herpes developed during the study. Herpes simplex virus was the major cause of oral mucosal lesions seen in patients with leukemia. A majority of the episodes involved multiple oral sites and caused large atypical lesions. All lesions healed after topical or intravenous acyclovir therapy. Herpes simplex infection should be ruled out in all cases of oral ulcers detected in patients being treated for leukemia.