Effects of valacyclovir in cats infected with feline herpesvirus 1

• Published in: American journal of veterinary research Vol. 58; no. 10; p. 1141
• Main Authors: Nasisse, M.P. (University of Missouri, Columbia, MO.), Dorman, D.C, Jamison, K.C, Weigler, B.J, Hawkins, E.C, Stevens, J.B
• Format: Journal Article
• Language: English
• Published: United States 01.10.1997
• Subjects: Acyclovir - administration & dosage; Acyclovir - analogs & derivatives; Acyclovir - pharmacology; Acyclovir - therapeutic use; Administration, Oral; Animals; ANTIVIRAL; ANTIVIRAL AGENTS; Antiviral Agents - administration & dosage; Antiviral Agents - pharmacology; Antiviral Agents - therapeutic use; APPLICATION METHODS; Blood Cell Count; Bone Marrow - drug effects; Bone Marrow - pathology; Cat Diseases - drug therapy; Cat Diseases - epidemiology; Cat Diseases - pathology; CATS; CHAT; Conjunctivitis - drug therapy; Conjunctivitis - epidemiology; Conjunctivitis - veterinary; Dose-Response Relationship, Drug; DRUG THERAPY; DRUG TOXICITY; DRUGS; EFFICACY; Female; GATO; Herpesviridae - drug effects; Herpesviridae - physiology; Herpesviridae Infections - drug therapy; Herpesviridae Infections - veterinary; Herpesviridae Infections - virology; HERPETOVIRIDAE; Incidence; Kidney Tubules - drug effects; Kidney Tubules - pathology; Liver - drug effects; Liver - pathology; MEDICAMENT; MEDICAMENTOS; METHODE D'APPLICATION; METODOS DE APLICACION; ORAL ADMINISTRATION; Rhinitis - drug therapy; Rhinitis - epidemiology; Rhinitis - veterinary; SAFETY; SECURITE; SEGURIDAD; Severity of Illness Index; Specific Pathogen-Free Organisms; TERAPEUTICA MEDICAMENTOSA; THERAPEUTIQUE MEDICAMENTEUSE; Time Factors; TOXICIDAD; TOXICITE; TOXICITY; Valine - administration & dosage; Valine - analogs & derivatives; Valine - pharmacology; Valine - therapeutic use; VIRICIDAS; Virus Replication - physiology; Virus Shedding
• ISSN: 0002-9645; 1943-5681
• DOI: 10.2460/ajvr.1997.58.10.1141

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.