Efficacy of oral supplementation with L-lysine in cats latently infected with feline herpesvirus

David J Maggs, Mark P. Nasisse, Philip H Kass

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Abstract

Objective - To examine the effects of orally administered L-lysine on clinical signs of feline herpesvirus type 1 (FHV-1) infection and ocular shedding of FHV-1 in latently infected cats. Animals - 14 young adult, FHV-1-naive cats. Procedure - Five months after primary conjunctival inoculation with FHV-1, cats were rehoused and assigned to receive 400 mg of L-lysine in food once daily for 30 days or food only. On day 15, all cats received methylprednisolone to induce viral reactivation. Clinical signs of infection were graded, and viral shedding was assessed by a polymerase chain reaction assay throughout our study. Peak and trough plasma amino acid concentrations were assessed on day 30. Results - Fewer cats and eyes were affected by conjunctivitis, and onset of clinical signs of infection was delayed on average by 7 days in cats receiving L-lysine, compared with cats in the control group; however, significant differences between groups were not demonstrated. Significantly fewer viral shedding episodes were identified in the treatment group cats, compared with the control group cats, after rehousing but not following corticosteroid-induced viral reactivation. Mean plasma L-lysine concentration was significantly increased at 3 hours but not at 24 hours after L-lysine administration. Plasma arginine concentration was not significantly altered. Conclusions and Clinical Relevance - Once daily oral administration of 400 mg of L-lysine to cats latently infected with FHV-1 was associated with reduced viral shedding following changes in housing and husbandry but not following corticosteroid administration. This dose caused a significant but short-term increase in plasma L-lysine concentration without altering plasma arginine concentration or inducing adverse clinical effects.

Original languageEnglish (US)
Pages (from-to)37-42
Number of pages6
JournalAmerican Journal of Veterinary Research
Volume64
Issue number1
DOIs
StatePublished - Jan 1 2003

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Felid herpesvirus 1
Herpesviridae
Felidae
Lysine
mouth
lysine
Cats
cats
Virus Shedding
viral shedding
adrenal cortex hormones
arginine
Arginine
Adrenal Cortex Hormones
eyes
infection
Herpesviridae Infections
Food
Control Groups
conjunctivitis

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Efficacy of oral supplementation with L-lysine in cats latently infected with feline herpesvirus. / Maggs, David J; Nasisse, Mark P.; Kass, Philip H.

In: American Journal of Veterinary Research, Vol. 64, No. 1, 01.01.2003, p. 37-42.

Research output: Contribution to journalArticle

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abstract = "Objective - To examine the effects of orally administered L-lysine on clinical signs of feline herpesvirus type 1 (FHV-1) infection and ocular shedding of FHV-1 in latently infected cats. Animals - 14 young adult, FHV-1-naive cats. Procedure - Five months after primary conjunctival inoculation with FHV-1, cats were rehoused and assigned to receive 400 mg of L-lysine in food once daily for 30 days or food only. On day 15, all cats received methylprednisolone to induce viral reactivation. Clinical signs of infection were graded, and viral shedding was assessed by a polymerase chain reaction assay throughout our study. Peak and trough plasma amino acid concentrations were assessed on day 30. Results - Fewer cats and eyes were affected by conjunctivitis, and onset of clinical signs of infection was delayed on average by 7 days in cats receiving L-lysine, compared with cats in the control group; however, significant differences between groups were not demonstrated. Significantly fewer viral shedding episodes were identified in the treatment group cats, compared with the control group cats, after rehousing but not following corticosteroid-induced viral reactivation. Mean plasma L-lysine concentration was significantly increased at 3 hours but not at 24 hours after L-lysine administration. Plasma arginine concentration was not significantly altered. Conclusions and Clinical Relevance - Once daily oral administration of 400 mg of L-lysine to cats latently infected with FHV-1 was associated with reduced viral shedding following changes in housing and husbandry but not following corticosteroid administration. This dose caused a significant but short-term increase in plasma L-lysine concentration without altering plasma arginine concentration or inducing adverse clinical effects.",
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