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Letter to the Editor - Therapy Letter
2017:83:2;256-259
doi: 10.4103/0378-6323.199423
PMID: 28164895

Extensive and refractory genital herpes in human immunodeficiency virus-infected patient successfully treated with imiquimod: Case report and literature review

Helena Reich Camasmie, Caroline Barbosa, Omar Lupi, Ricardo Barbosa Lima, Marcio Serra, Antonio Macedo D'Acri, Carlos José Martins
 Dermatology Department, Gaffree and Guinle University Hospital, Federal University of the State of Rio de Janeiro, Rio de Janeiro, Brazil

Correspondence Address:
Helena Reich Camasmie
Rua Mariz e Barros, 775, Tijuca, 20270-002 Rio de Janeiro
Brazil
How to cite this article:
Camasmie HR, Barbosa C, Lupi O, Lima RB, Serra M, D'Acri AM, Martins CJ. Extensive and refractory genital herpes in human immunodeficiency virus-infected patient successfully treated with imiquimod: Case report and literature review. Indian J Dermatol Venereol Leprol 2017;83:256-259
Copyright: (C)2017 Indian Journal of Dermatology, Venereology, and Leprology

Sir,

Herpes genitalis is the most common sexually transmitted disease worldwide. Its incidence has been increasing, especially among positive human immunodeficiency virus patients.[1] The typical presentations of cutaneous herpes simplex virus are well known and rarely cause diagnostic difficulty. However, in patients with advanced human immunodeficiency virus infection, unusual and severe manifestations of herpes simplex virus infection are common and are included among the opportunistic processes that define the acquired immunodeficiency syndrome.[2] The unusual clinical presentations increasingly observed in clinical practice have led to the use of new treatment modalities such as immunomodulatory agents, in particular topical imiquimod cream as an adjunctive therapy to the first-line drug acyclovir with satisfactory results.[1] Our case report describes a human immunodeficiency virus-infected man with a herpetic infection that was refractory to acyclovir but not to imiquimod, followed by literature review of similar cases.

A 54-year-old human immunodeficiency virus-infected man presented with a 5-month history of painful penile erosions. Physical examination revealed extensive herpetiform erosions involving the penis [Figure 1a]. His CD4 cell count was 299/µL and his viral load was undetectable. He had been receiving antiretroviral therapy and had no previous history of genital herpes infection. He had already been treated in a primary health-care unit with acyclovir (4 g daily), penicillin and azithromycin with no improvement. Results of blood tests were positive for syphilis (venereal disease research laboratory 1:32; fluorescent treponemal antibody-absorption positive) and herpes simplex virus (immunoglobulin M negative; immunoglobulin G positive), cytomegalovirus (immunoglobulin M negative; immunoglobulin G positive) and chlamydia (immunoglobulin M negative; immunoglobulin G positive). Skin biopsy was inconclusive. The patient was hospitalized and began empiric treatment with crystalline penicillin and intravenous acyclovir (800 mg three times daily) for 15 days due to oral acyclovir refractory herpes simplex. He was discharged with partially improved but still unhealed genital ulcers.

Figure 1a: Genital penile erosions before treatment

A second skin biopsy revealed typical herpes inclusions and multinucleated giant cells and immunohistochemical studies supported the diagnosis of herpes simplex virus 1 and 2 infections [Figure 2a] and [Figure 2b]. Subsequently, the patient was treated initially with famciclovir (500 mg two times daily for 8 weeks), but due to high medication cost, it was changed back to acyclovir (400 mg six times daily for 12 weeks). Despite these multiple treatment attempts, he experienced no clinical improvement. The patient was given a trial regimen of topical 5% imiquimod cream applied three times/week for 8 weeks and then five times/week, together with oral acyclovir (400 mg three times daily), for 16 weeks. Complete healing of the lesions was achieved after treatment was completed [Figure 1b].

Figure 1b: Clinical result after imiquimod therapy
Figure 2a: Multinucleated giant cells with viral nuclear inclusions and nuclear molding (H and E, ×400)
Figure 2b: Immunohistochemical study (×400) positive for herpes simplex virus

Herpes simplex virus infections are exceedingly common and pose a particular problem in immunocompromised patients. They may experience an excessive number and size of lesions in both primary and reactivated herpes simplex virus infections in comparison with immunocompetent patients. As CD4 cell counts drop and immunosuppression worsens, recurrent episodes increase in frequency and severity until there is no period of complete healing between episodes. Nonhealing ulcers of the genital region in immunocompromised patients should elicit a high degree of suspicion of chronic herpes simplex virus infection. Chronic herpes simplex virus ulcer of more than 1 month duration is an acquired immunodeficiency syndrome-defining illness in human immunodeficiency virus-infected patients.[3]

Treatment with antivirals such as acyclovir is still the mainstay of prescribed therapy. For the treatment of recurrent episodes, the use of antivirals can reduce the time of healing, time of cessation of viral shedding and duration of symptoms.[1] Increased dosages of acyclovir, valacyclovir and famciclovir may be required.[3]

The emergence of drug-resistant herpesvirus strains is associated with the increase in the use of acyclovir.[4] Foscarnet sodium has been the drug of choice in cases of acyclovir resistance. However, it has also been associated with drug-resistant strains that replicate despite drug presence.[5] Success with topical imiquimod in cases of nonhuman immunodeficiency virus-associated recurrent genital herpes simplex virus infection with documented acyclovir resistance was reported.[6] Topical imiquimod is an immunomodulatory drug that signals through toll-like receptors 7 to stimulate cell-mediated immune responses, showing promising results for the treatment of herpes simplex virus infection and in atypical cases, studies showed that imiquimod provides an added benefit.[1] Therefore, imiquimod presents itself as a valuable ally when treating acyclovir refractory herpes simplex virus infections, particularly in the setting of emerging resistance.

Literature review indicated that despite antiviral resistance, treatment with imiquimod has been successful [Table - 1]. Data on 25 patients from 14 different studies showed that clinical cure was the main result with only some instances of recurrences (n = 5) after topical 5% imiquimod therapy.

Table 1: Results after use of imiquimod in antiviral-resistant cases

Our patient failed to respond to classic acyclovir monotherapy, showing a great response after the addition of topical imiquimod cream. Imiquimod may be considered as a possible adjuvant therapy in resistant genital herpes simplex virus infections in light of our experience with this difficult case.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.[11]

References
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