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20.07.2014

Acyclovir for recurrent herpes simplex, treatments for herpes simplex virus type 1 - For You

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Human herpes simplex virus (HSV) infection in neonates can result in devastating outcomes, including mortality and significant morbidity. The following recommendations are based on the 2009 guidelines for prevention and treatment of opportunistic infections[1]. Patients who have frequent or severe recurrences of HSV infections should be considered for suppressive therapy with valacyclovir, famciclovir, or acyclovir(Figure 4.
Neonatal herpes simplex virus infections in Canada: Results of a 3-year national prospective study.
The treatment of orolabial lesions and genital HSV infection (initial or recurrent) should consist of a 5 to 14 day course of valacyclovir (Valtrex), famciclovir (Famvir), or acyclovir (Zovirax) (Figure 4.
Guidelines for prevention and treatment of opportunistic infections in HIV-infected adults and adolescents: recommendations from CDC, the National Institutes of Health, and the HIV Medicine Association of the Infectious Diseases Society of America. Additional support for use of suppressive therapy in HIV-infected patients arose from studies that have shown HSV outbreaks can result in increased HIV transcription and increased genital and plasma HIV RNA levels[12,13]. Effect of serologic status and Cesarean delivery on transmission rates of herpes simplex virus from mother to infant.
In the United States, approximately 70% of HIV-infected adults have serologic evidence of established infection with HSV-2 infection and 95% are seropositive for either HSV-1 or HSV-2[1].
For patients with severe mucocutaneous HSV lesions, intravenous acyclovir is recommend for initial therapy, followed by oral therapy when the lesions start to resolve. These findings correspond with data that show certain HSV regulatory proteins (ICPO, ICP27 and VP16) can induce HIV replication and herpes simplex virions can increase HIV expression in macrophages[14].
Recommendations for managing newborns known to have been exposed intrapartum to HSV are based on expert opinion because a randomized trial to compare management options is not feasible.
The presence of a chronic ulcerative HSV lesion does not necessarily indicate resistance to acyclovir. For persons co-infected with HIV and HSV, most available data suggest HSV suppressive therapy has a favorable impact on genital and plasma HIV levels[15,16,17,18]. Guidance is provided for the empirical management of infants with suspected clinical sepsis, including those who do not respond to antibacterial therapy. Studies show that 75% to 90% of individuals who are seropositive for HSV-2 were unaware of their infection.[10] All infants, therefore, must be considered to be potentially at risk for NHSV infection. In general, these patient should receive therapy for HSV until the lesions have completely healed[10].
In one study that involved HSV suppressive therapy for HIV and HSV co-infected women in Africa on highly active antiretroviral therapy, the women had reduced genital shedding of HSV, but no significant decrease in plasma HIV RNA levels. In this context, antiviral therapy near the end of pregnancy can lower recurrence of genital HSV and shedding at delivery;[17] however, it is not clear whether this prophylaxis translates to a reduced risk for NHSV infection. If the patient has received multiple courses of therapy for recurrent HSV infection, or is taking chronic HSV suppressive therapy when new lesions develop, greater consideration should be given to possible acyclovir-resistant HSV.
Two large clinical trials investigated the impact of suppressive herpes therapy on HIV acquisition in HIV-negative, HSV-2 co-infected individuals, but found no benefit of suppressive therapy[19,20].
Guidelines regarding the role of Cesarean delivery and the indications for acyclovir are published[16][18][19] but are not specifically addressed in the present statement.Obstetrical procedures that can cause scalp abrasions or a break in the infant’s skin during labour and delivery may increase risk of NHSV transmission to a newborn infant. Regional distribution of antibodies to herpes simplex virus type 1 (HSV-1) and HSV-2 in men and women in Ontario, Canada.


Evaluation and treatment of acyclovir-resistant HSV infection is discussed in Case 2 in this Dermatologic Manifestations module.
Antenatal seroprevalence of herpes simplex virus type 2 (HSV-2) in Canadian women: HSV-2 prevalence increases throughout the reproductive years. Several reports have described patients who developed atypical ulcerative genital HSV lesions after starting highly active antiretroviral therapy, presumably caused by immune reconstitution[2,7]; these lesions may be difficult to treat, despite the absence of acyclovir resistance. Occasionally, disease presents for the first time between four and six weeks after birth;[4] therefore, infants up to 42 days of age should be fully evaluated for NHSV when clinical features are consistent with NHSV. Expert consultation is important because the utility of testing modalities varies according to sample type, and the laboratory must provide general as well as centre-specific advice on the types of specimens to send for testing.
When skin lesions are present, rapid diagnostic techniques, such as direct immunofluorescence of virus-infected cells for the presence of HSV antigens, are of value. Genital shedding of herpes simplex virus among symptomatic and asymptomatic persons with HSV-2 infection. Caution should be exercised when using a negative CSF HSV PCR to rule out CNS HSV, particularly when the sample is obtained in the early stages of illness (the first 24 h to 48 h).Because CNS disease can be very subtle, any patient with suspected NHSV infection should have a lumbar puncture performed for CSF DNA PCR testing as soon as it is clinically feasible to do so, unless there is a contraindication to performing a lumbar puncture. A poorer prognosis has also been associated with persistence of HSV DNA in the CSF of patients on acyclovir.[35]Infant serology is not useful for diagnosing NHSV for three main reasons. Third, the commercially available assays for HSV IgM antibodies have only variable and limited reliability.Managing NHSV infectionsIntravenous acyclovir is the treatment of choice for treating NHSV. For SEM disease, the duration of therapy is 14 days, while for disseminated or CNS disease, the minimum duration of treatment is 21 days. Oral ACV has limited bioavailability, resulting in inadequate drug levels for treatment;[38] consequently, parenteral therapy is required. Third trimester antiviral prophylaxis for preventing maternal genital herpes simplex virus (HSV) recurrences and neonatal infection.
Serum hepatic transaminase levels should be measured to provide supporting evidence for disseminated HSV infection. For all the above tests, clinicians and laboratory staff should work together to minimize the turn-around time for test results. Neonatal herpes simplex meningoencephalitis associated with fetal monitor scalp electrodes. Herpes simplex virus infection after vacuum-assisted vaginally delivered infants of asymptomatic mothers.
Herpes simplex virus infection in young infants during 2 decades of empiric acyclovir therapy.
Human antibodies to herpes simplex virus type 1 glycoprotein C are neutralizing and target the heparan sulfate-binding domain. If the infant’s swabs are negative, ACV can be stopped if type-specific serology testing shows that the mother has recurrent HSV. Neonatal herpes simplex: Clinical findings and outcome in relation to type of maternal infection. In addition to mucous membrane swabs, some experts recommend blood for polymerase chain reaction (PCR), if this test is available.
Safety and efficacy of high-dose acyclovir in the management of neonatal herpes simplex virus infections.


Predictors of morbidity and mortality in neonates with herpes simplex infections: The National Institute of Allergy and Infectious Diseases Collaborative Antiviral Study Group.
Clinicians should speak with a laboratory specialist or infectious diseases consultant when neonatal herpes simplex virus (NHSV) is suspected and laboratory tests are being requested.
Pending laboratory confirmation, consider investigations and treatment of NHSV for the following at-risk patients: Infants started on IV antibiotics for suspected sepsis (especially infants presenting with seizure or yielding abnormal CSF) who do not improve rapidly and have negative bacterial cultures at 24 h incubation.
Detection of viral DNA in neonatal herpes simplex virus infections: Frequent and prolonged presence in serum and cerebrospinal fluid. Infants started on IV antibiotics for suspected sepsis who are found to have unexplained hepatitis. Multiplex real-time PCR for the simultaneous detection of herpes simplex virus, human herpesvirus 6, and human herpesvirus 7. Treatment and follow-up of infants with NHSV infections Early therapy with intravenous (IV) ACV improves the prognosis for all three presentations of NHSV. Quantitation of viral load in neonatal herpes simplex virus infection and comparison between type 1 and type 2. For infants with CNS disease, CSF should be sampled near the end of a 21-day course of therapy. Oral ACV is contraindicated for the acute treatment of NHSV because drugs levels are too low.
Time course of seroconversion by HerpeSelect ELISA after acquisition of genital herpes simplex virus type 1 (HSV-1) or HSV-2. Data are less convincing for SEM or disseminated disease, but suppressive therapy may still be offered.
Guidance on management of asymptomatic neonates born to women with active genital herpes lesions. Follow-up is necessary to detect and manage adverse effects related to suppressive ACV treatment as well as for the neurodevelomental sequelae of NHSV. Complete blood count, and urea and creatinine levels should be checked monthly for adverse effects, and the dose of ACV adjusted for growth. Infants should be followed in a program that enables their evaluation for the neurodevelopmental, ophthalmological and aural consequences of NHSV infection. Preventing NHSV infectionsStrategies to prevent NHSV, including the identification of high-risk pregnancies, Cesarean delivery, maternal antiviral therapy, and anticipatory guidance for prospective mothers and partners, are largely beyond the scope of this statement. Mothers with herpes labialis should wear a disposable mask when caring for their infant <6 weeks of age, until lesions are crusted.
There is no contraindication to breastfeeding unless there are herpetic lesions on the breast.



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