feline herpesvirus-1 oleary
TRANSCRIPT
Ocular Manifestations of Feline Herpesvirus-1
Louise O’Leary, ISU Ophthalmology Resident 2019
Feline Herpesvirus – 1
• Feline viral rhinotracheitis •Widespread infection – highly contagious • Spread via oronasal/conjunctiva – direct and indirect • Infected as MDA wanes (8-12 weeks) • Vaccines only partially protective
Viral Features• Latency: trigeminal ganglion, +_ cornea +_skin • Recrudesence – immunosuppression: stress, glucocorticoids,
cyclosporine, FeLV, FIV etc. • Rescrudesence vs persistent low level replication • Epitheliotoxic virus – conjunctiva*, cornea, nasal + oral mucous
membranes, dermis – cytolysis of infected cells
Clinical signs
• Sneezing • Nasal/ocular discharge • Blepharospasm • Chemosis/hyperemia • Inappetance • Lethargy
https://en.wikipedia.org/wiki/Feline_viral_rhinotracheitis
Diagnosis• Presumptive • **Co –infections
common** • Pathognomic –
dendritic ulcers • IDEXX Feline Upper
Respiratory Disease PCR Panel – Mycoplasma, Chlamydophila, Bordetella, Herpes? • Other molecular
methods – rarely used
https://veteriankey.com/cornea/
Herpesvirus Specific Treatments• Cidofovir 0.5% ophthalmic solution – BID • Famciclovir 90mg/kg BID PO – plasma and tears – may clear
persistent low level infection • Ganciclovir? • Redundant –trifluridine, idoxuridine, vidarabine etc. • L-lysine? Immune enhancing probiotics? • Reduction of stress
Cidofovir• Inhibits viral replication - effective • Safe, well tolerated • Long acting – BID dosing • Compounding pharmacies • 6 months shelf life • Reasonable priced
Famciclovir• Inhibits viral replication • Tablets (125mg, 250mg, 500mg) • Safe • Well-tolerated – GI side effects,
renal disease? • Easily available • 90mg/kg BID PO – plasma and
tears • May clear persistent infection?
Thomasy et al JAVMA 2016
Conjunctivitis• Most common manifestation • Primary vs recurrent • Uni/bilateral • Hyperemia, chemosis, epiphora,
blepharospasm • +_conjunctival ulcers • Usually self-limiting • Co-infections? • Supportive care - lubricant • Treatment if painful, severe, co-infection
Andrew JFMS 2001
Gould JFMS 2011
Andrew JFMS 2001
Conjunctival Cytology
• Inclusion bodies: - Intranuclear herpes
(rare, need special stain)
- Intracytoplasmic (Mycoplasma, Chlamydia)
• Cellular infiltrate – - Neutrophilic (herpes)
Neutrophilic Conjunctivitis - Herpes
Chlamydophila
Mycoplasma
http://blog.vetbloom.com/ophthalmology/conjunctival-cytology-a-great-diagnostic-tool-youre-probably-not-using/
Treatment of Co-infections• Mycoplasma and Chlamydia - - Doxycycline 10mg/kg PO SID – 4 weeks - Terramycin/Erythyromycin TID
• Calicivirus – RNA virus - Antivirals don’t work, supportive care
Ulcerative Keratitis
• 2nd most common manifestation • Primary infection or recrudescence • Epitheliotoxic virus • Dendritic, geographic ulcer – superficial • Stromal involvement – secondary bacterial
infection • Fluorescein +_ Rose Bengal
https://veteriankey.com/cornea/
https://veteriankey.com/cornea/
FHV-1 Ulcerative Keratitis Treatment• Topical antibiotics +_serum • Atropine • NSAID/gabapentin • Cidofovir 0.5% BID/Famciclovir 90mg/kg BID – 1 week past
resolution of CS • +_E-collar
Non-Healing Corneal Ulcer• Indolent” • Debride loose edges with CTA – repeatable • Diamond burr • **GRID KERATOTOMY CONTRAINDICATED IN
CATS** • Superficial Keratectomy
Loose edges
KCS• Exact pathogenesis
unknown • Clinical signs milder than in
dogs - Conjunctival hyperemia,
lacklustre cornea, recurrent ulcers • Lubricant • Tacrolimus – corneal health • PDT
Andrew JFMS 2001
Symblepharon
• Sequela to primary disease
• Conjunctiva – conjunctiva (bulbar, palpebral, TEL) • Conjunctiva - cornea
• Surgical correction – recurrence frequent, amnion? • Prevention – lubrication/
separation
https://veteriankey.com/conjunctiva/
https://www.visioncareforanimals.com/gallery/eye-diseases
Slatter’s Fundamentals of Veterinary Ophthalmology
Stromal Keratitis
• Uncommon • Steroid use may predispose • Immune-mediated disease –
suspect delayed hypersensitivity to virus in cornea
• Fibrosis, oedema, cellular infiltrate, (stromal) neovascularisation • Non-painful • Vision-threatening
Andrew JFMS 2001
https://www.cliniciansbrief.com/article/conjunctivitis-cats
http://www.abcdcatsvets.org/feline-herpesvirus/
Stromal Keratitis Treatment• Immunosuppression/modulation – topical steroids, cyclosporine • Antiviral
Eosinophilic Keratoconjunctivitis• Role unclear- immune-mediated • Cornea and conjunctiva • White/pink, raised tissue
extending across cornea • Vision-loss/discomfort as
progresses • +_Fluorescein + over tissue
Davidwilliams.uk.
http://mspca.createconquer.com/angell_services/feline-eosinophilic-keratitis/
Diagnosis - Cytology• Single eosinophil!!
Epithelial cells, neutrophils, eosinophils, mast cells Eosinophils
Treatment – Eosinophilic Keraconjunctivitis
• Topical steroid (dex) +_ anti-viral • Optimmune (0.2% CSA) + topical NSAID • 1% CSA • Topical 0.5% megesterol acetate • Systemic anti-inflammatories – triamcinolone, prednisolone • **Slow taper to lowest dose that controls clinical signs** - recurrence common
Corneal Sequestra
• DSH • Predisposing factors – steroids, chronic irritation (ulcer etc) • Pathogenesis unclear • +_pain • +_ulcer around • Can increase in size and depth Andrew JFMS 2001
Treatment – Corneal Sequestra
• Active monitoring — supportive • Treat ulcer if present • Diamond burr removal • Surgical excision +_ grafting procedure • Recurrence
Dermatitis/Blepharitis
• Ulcerative dermatitis: periocular, facial, trunk, distal extremities • Pruritic • Famciclovir 90mg/kg BID
Gould JFMS 2011
https://dermvettacoma.com/feline-herpes-virus-dermatitis/
Canine Herpesvirus– Emerging Pathogen?• First case at ISU • Bilateral, painful, non-resolving conjunctivitis • Dendritic ulcers! • Ganciclovir, Idoxuridine, • Cidofovir?
References• Andrew, S. (2001). Ocular Manifestations of Feline Herpesvirus. Journal of Feline Medicine and Surgery, 3(1), 9–16. • Gould, D. (2011). Feline Herpesvirus-1: Ocular Manifestations, Diagnosis and Treatment Options. Journal of Feline
Medicine and Surgery, 13(5), 333–346
• Townsend, W. M., Jacobi, S., Tai, S. H., Kiupel, M., Wise, A. G., & Maes, R. K. (2013). Ocular and neural distribution of feline herpesvirus-1 during active and latent experimental infection in cats. BMC veterinary research, 9, 185. doi:10.1186/1746-6148-9-185
• Maggs DJ, Chang E, Nasisse MP, et al. Persistence of herpes simplex virus type 1 DNA in chronic conjunctival and eyelid lesions of mice. J Virol 1998;72:9166–9172
• Maggs DJ, Clarke HE. In vitro efficacy of ganciclovir, cidofovir, penciclovir, foscarnet, idoxuridine, and acyclovir against feline herpesvirus type-1. Am J Vet Res2004;65:399–40
• Lappin, M. R. et al. (2009) ‘Pilot Study to Evaluate the Effect of Oral Supplementation of Enterococcus Faecium SF68 on Cats with Latent Feline Herpesvirus 1’, Journal of Feline Medicine and Surgery, 11(8), pp. 650–654.
• Nasisse, MP, Glover, TL, Moore, CP, Weigler, BJ (1998) Detection of feline herpesvirus 1 DNA in corneas of cats with eosinophilic keratitis or corneal sequestration. American Journal of Veterinary Research 59, 856–858
• Thomasy SM, Shull O, Outerbridge CA, et al. Oral administration of famciclovir for treatment of spontaneous ocular, respiratory or dermatologic disease attributed to feline herpesvirus type-1: a retrospective review in 59 client-owned cats. J Am Vet Med Assoc 2016
• Sebbag L, Thomasy SM, Woodward AP, et al. Pharmacokinetic modeling of penciclovir and BRL42359 in the plasma and tears of healthy cats to optimize dosage recommendations for oral administration of famciclovir. Am J Vet Res. 2016 Aug;77(8):833-45
References • Ledbetter E, Nicklin A, Spertus et al. Evaluation of topical ophthalmic ganciclovir gel for the treatment of dogs with experimentally induced
ocular canine herpesvirus-1 infection. American Journal of Veterinary Research. Jul 2018, Vol. 79, No. 7, Pages 762-769
• Eric C. Ledbetter, Chloe B. Spertus, Matthew R. Pennington, Gerlinde R. Van de Walle, Bonnie E. Judd, and Hussni O. Mohammed.Journal of Ocular Pharmacology and Therapeutics.Dec 2015.
Questions??