valacyclovir and Conjunctivitis

To determine whether orally administered valacyclovir can be used safely and effectively to treat cats with primary, feline herpesvirus 1 (FHV-1) infection.. 14 specific-pathogen-free adult cats.. Cats were infected with FHV-1 strain 87-727 (300 microliters, 10(7) plaque-forming units/ml) by ocular and nasal inoculations, and were treated every 6 hours with dextrose (controls) or valacyclovir (60 mg/kg of body weight, PO). Virus shedding from both eyes and the oropharynx was monitored every 2 days by virus isolation, and subjective clinical scores were assigned daily for ocular and nasal discharge and conjunctival hyperemia. Urinalysis, CBC, and serum biochemical analysis were done prior to inoculation, and on days 2, 5, 7, 9, and 12 of infection. Differences in CBC and serum biochemical indices between groups were compared, as were differences between preinfection values and maximal postinfection values, rectal temperature, and scores for disease severity.. All cats developed acute conjunctivitis and rhinitis typical of FHV-1 infection. Beginning between days 6 and 9, valacyclovir-treated cats became noticeably more lethargic and dehydrated than did cats of the control group. Total WBC and neutrophil counts were significantly lower in cats of the valacyclovir group. The experiment was terminated on day 12 for humane reasons. Histologic changes attributable to FHV-1 infection were similar in all cats. Additional histologic abnormalities seen only in the valacyclovir-treated cats were coagulative necrosis of the renal tubular epithelium, centrilobular atrophy and hepatic necrosis, and severe bone marrow depression.. Cats appear to be uniquely sensitive to the toxic effects of valacyclovir, and even high doses appear not to suppress FHV-1 replication in acutely infected cats.. Use of valacyclovir is of questionable value in cats with acute FHV-1 infection and, at high doses, the drug may be toxic.

Topics: Acyclovir; Administration, Oral; Animals; Antiviral Agents; Blood Cell Count; Bone Marrow; Cat Diseases; Cats; Conjunctivitis; Dose-Response Relationship, Drug; Female; Herpesviridae; Herpesviridae Infections; Incidence; Kidney Tubules; Liver; Rhinitis; Severity of Illness Index; Specific Pathogen-Free Organisms; Time Factors; Valacyclovir; Valine; Virus Replication; Virus Shedding

The objective of this study was to explore the ocular and systemic outcomes of herpes simplex virus type 1 (HSV-1) infection in guinea pigs, to monitor the spontaneous reactivation of the virus, and to assess the effectiveness of various treatments, drawing comparisons to conventional rabbit models.. Guinea pigs and rabbits were infected in the right corneas with differing doses and strains of HSV-1. Observations were made over a 71-day period, focusing on comparing ocular lesions, viral shedding patterns, and weight loss between the two animal models. Postinfection, the effectiveness of trifluridine ophthalmic drops, oral acyclovir, and valacyclovir was evaluated. The confirmation of viral infection was done through virus titer assay, fluorescein staining, and corneal imaging.. Guinea pigs and rabbits manifested symptoms akin to human herpes stromal keratitis (HSK) when exposed to varying titers of viral suspension. Regardless of the initial viral load, all guinea pig groups demonstrated comparable ocular pathology, witnessing conditions like blepharitis and conjunctivitis within 3 days, progressing to severe conditions, including total corneal opacification and necrotizing keratitis. Tear film collection revealed nonsignificant differences in viral plaques between all groups. Notably, guinea pigs in the low-infection group experienced the most weight loss, although without significant differences. The replication of the same experiment on rabbits yielded consistent results in disease pathology across different groups, with occurrences of blepharitis and conjunctivitis. Interestingly, after initial resolution, guinea pigs presented a more frequent and broadly observed increase in disease score and corneal opacity, a phenomenon rarely seen in rabbits within the same timeframe. The effectiveness of 1% trifluridine was observed in mitigating ocular HSV-1 disease in both species, whereas oral acyclovir and valacyclovir were found to be detrimental and ineffective in guinea pigs but not in rabbits.. This study demonstrates the potential suitability of guinea pigs as new models for ocular HSV-1 investigations, filling a critical preclinical void of models capable of showcasing spontaneous HSV reactivation in the eye. The observed similarities and differences in the reactions of guinea pigs and rabbits to HSV-1 infection and treatments provide crucial insights, laying the foundation for future studies on ocular HSV pathogenesis, latency, and improved treatment options.

Topics: Acyclovir; Animals; Antiviral Agents; Blepharitis; Conjunctivitis; Cornea; Guinea Pigs; Herpes Simplex; Herpesvirus 1, Human; Humans; Rabbits; Trifluridine; Valacyclovir; Weight Loss

Following Tx for facial blisters, our patient returned with what appeared to be viral conjunctivitis. Further evaluation revealed a missed tip-off to the proper Dx.

Topics: Anti-Bacterial Agents; Antiviral Agents; Conjunctivitis; Ear; Erythromycin; Female; Herpes Labialis; Humans; Keratitis, Herpetic; Lip; Middle Aged; Mouth; Nose; Otitis Media; Treatment Outcome; Trifluridine; Valacyclovir

To report recurrent conjunctivitis and scleritis secondary to coexistent conjunctival pemiphigus vulgaris and cryptic herpes simplex infection.. Case report.. Retrospective review.. A 54-year-old woman presented with recurrent left eye irritation and redness. Four years earlier, she was diagnosed (biopsy) with cutaneous pemphigus vulgaris requiring immunomodulatory therapies. She was receiving oral acyclovir for recurrent genital herpes and intravenous immunoglobulin for pemphigus. Examination revealed unilateral necrotizing scleritis and conjunctivitis. Immunohistochemical staining of biopsies demonstrated conjunctival pemphigus and herpes in conjunctiva and sclera. Valacyclovir therapy brought resolution.. Cryptic ocular herpes may confound matters in someone with an autoimmune disease thought to be the sole source of ocular inflammation. Immunohistochemical analysis can resolve the mystery.

Topics: Acyclovir; Antiviral Agents; Conjunctival Diseases; Conjunctivitis; Female; Herpes Simplex; Humans; Immunoglobulins, Intravenous; Medical Records; Middle Aged; Necrosis; Pemphigus; Recurrence; Retrospective Studies; Scleritis; Valacyclovir; Valine