Biology:Feline panleukopenia

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Short description: Species of parvovirus


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Carnivore protoparvovirus 1
Electron micrograph of canine parvovirus
Electron micrograph of canine parvovirus
Virus classification e
Member virus[1]
Synonyms[2]
  • Canine parvovirus
  • Feline panleukopenia virus
  • Feline parvovirus
  • Mink enteritis virus
  • Raccoon parvovirus

Feline panleukopenia virus (FPLV) is a species of parvovirus[3] that can infect all wild and domestic members of the felid (cat) family worldwide.[4] It is a highly contagious, severe infection that causes gastrointestinal, immune system, and nervous system disease. ("Panleukopenia" means a decrease in the number of white blood cells.[5])

It has been thought to be single variant of Carnivore protoparvovirus (CPV 1);[2] however, it has been confirmed that a feline panleukopenia illness can be caused by CPV 2a, 2b, and 2c.[6][7]

FPLV is commonly referred to as:

  • feline infectious enteritis virus (FIE)[4]
  • feline parvovirus (FPV or FP or "feline parvo")[8]
  • feline parvoviral enteritis[4]

It is sometimes confusingly referred to as "cat plague" and "feline distemper".[9]

In addition to members of the felid family, it can also affect some members of related families (e.g. raccoon, mink).[4]

Transmission

The feline panleukopenia virus is considered ubiquitous, meaning it is in virtually every place that is not regularly disinfected. The infection is highly contagious among unvaccinated cats.[10]

Active immune response against FPLV antibodies play an important role in the immune response to the virus. Maternally-derived antibodies (MDA) efficiently protect kittens from fatal infection. This passively acquired immunity is later replaced by an active immune response obtained by vaccination or as a consequence of a natural infection.[11] In kittens, the period of greatest susceptibility to infection is when maternal antibodies are absent or waning and vaccine-induced immunity has not yet fully developed.[12]

Free-roaming cats are thought to be exposed to the virus during their first year of life. Those that develop subclinical infection or survive acute illness mount a robust, long-lasting, protective immune response.[4]

An infected cat sheds large amounts of virus in all body secretions including feces, vomit, urine, saliva, and mucus during the acute phase of illness. It can continue to shed the virus for as long as 6 weeks after recovery.[4] Subclinically ill cats can also shed the virus in body secretions. The virus can be carried or transferred on an infected object (such as bedding, food dishes, fur) or by other animals, fleas, and humans [13] (see: fomites). It persists long after evidence of the original body secretion has faded away, and can be transported long distances. Like all parvoviruses, FPLV is extremely resistant to inactivation and can survive for longer than one year in a suitable environment.[14] Kitten deaths have been reported in households of fully vaccinated cats, possibly because of exposure to large amounts of virus in the environment.[15][16]

Infection occurs when the virus enters the body through the mouth or nose. Whether illness results or not depends on the immunity in the victim vs. the number of individual virus particles (i.e. the amount of virus) entering the body.[10]

Clinical signs

The clinical manifestations of FPLV are variable based on the dose of the virus, the age of the cat, potential breed predispositions, and prior immunity from maternal antibodies, previous exposure, or vaccination.[17] Most infections are subclinical, as evidenced by the high seroprevalence of anti-FPV antibodies among some populations of unvaccinated, healthy cats. The cats that become clinically ill are usually <1 yr old, but older cats are also at risk.[18][19] There is high mortality in clinically affected kittens and sudden death can occur.[17]

Clinical signs usually develop in 4–6 days after exposure, but can show in 2–14 days.[20] The virus infects and destroys actively dividing cells in bone marrow, lymphoid tissues, intestinal epithelium, and—in very young animals—in the cerebellum and retina.[4] The virus primarily attacks the lining of the gastrointestinal tract, causing internal ulceration and, ultimately, total sloughing of the intestinal epithelium.

Primary signs include:

  • anorexia
  • lethargy[18]
  • profuse watery to bloody diarrhea (bloody diarrhea is more common in dogs with parvovirus than cats[17])
  • vomiting (most common in cats[17])

Clinical laboratory findings include (but are not limited to):[12][18]

  • electrolyte and total protein concentrations that reflect dehydration, vomiting, and diarrhea.
  • leukopenia
  • lymphopenia
  • neutropenia
  • thrombocytopenia

Other signs include: fever, loss of skin elasticity due to dehydration, abdominal pain, sternal recumbency with splayed legs and head droop, nasal discharge and conjunctivitis.[17] Cats may sit at a water bowl, but not drink.[4] Terminal cases are hypothermic and may develop septic shock and disseminated intravascular coagulation.[14]

Infection in pregnant cats can result in fetal resorption, mummification, abortion, or stillbirth of neonates.[4] Fetuses infected in utero that survive and kittens less than a few weeks of age that become infected can have cerebellar hypoplasia, retinal dysplasia, and optic neuropathy.[21]

Diagnosis

A presumptive clinical diagnosis of FPLV can be made for kittens with appropriate signalment, history, clinical findings and the history of no prior vaccination.[17]

The clinical diagnosis is usually supported by documenting parvovirus antigen in feces by ELISA (enzyme-linked immunosorbent assay) and PCR (polymerase chain reaction) assays. The availability of validated assays vary by country, but are becoming more common. PCR assays are so sensitive that FPV DNA can be amplified from feces of cats vaccinated with modified live strains of the virus. At least one of the ELISA antigen tests for dogs (SNAP®Parvo; IDEXX Laboratories) detects FPV in feline feces and has a cut point for a positive test result that excludes most vaccinated cats. Thus, this ELISA is superior to PCR for screening cats for FPV infection and can also be performed in the veterinary clinic. (These are only approved and licensed for detecting canine parvovirus, but it is generally known that they also detect FPL viral antigen in feline feces. These tests are used extra label because they allow rapid, inexpensive, in-house detection of the virus.[22]) Some cats will have completed the shedding period by the time the test is run, leading to false negative results.[17][22][23] Electron microscopy, virus isolation and seroconversion can also be used to document active or recent infection.

Leukopenia on a complete blood count (nadir 50–3,000 WBC/μL) supports a diagnosis of FPLV. In an unvaccinated cat, the presence of antibodies against FPV indicate that the cat either has the disease or has had the disease in the past. Elevated IgM titers (1:10 or greater) indicate active infection and if clinical signs are obvious (diarrhea, panleukopenia) the prognosis is poor. Elevated IgG titers (1:100 or greater) in a cat with clinical signs indicates a better prognosis.[24]

Differential diagnoses include salmonellosis, enteric toxins, feline immunodeficiency virus (FIV), feline leukemia virus (FeLV), cryptosporidiosis, pancreatitis, septicaemia with acute endotoxemia, toxoplasmosis, peritonitis, and lymphoma.[24]

Treatment

To contain the virus, cats with suspected or diagnosed FPLV should be kept in isolation.[25]

It requires immediate, aggressive treatment if the cat is to survive, as it can be fatal in less than 24 hours. Several articles and publications provide guidance for rescuers and veterinarians for optimizing outcomes.[26][25]

Treatment involves:[27]

  • anti-emetics
  • IV antibiotics
  • intravenous fluids with electrolytes
  • injections of vitamin B
  • plasma or whole blood transfusion

Feeding should be continued as long as possible.[28] A highly digestible diet is preferred, but the individual animal's preferences may dictate giving whatever it will eat.[25] In anorexic, hypoproteinemic, vomiting and diarrheic cats parenteral nutrition is required.[26]

In a disease outbreak, unvaccinated kittens or adults can be given anti-FPV serum containing FPV antibodies injected subcutaneously or intraperitoneal. This may provide protection for 2–4 weeks.[29][30] Therapeutic efficacy of anti-FPV serum has been demonstrated in dogs,[31] and similar beneficial effects may be expected in cats.[25]

Several studies have shown feline recombinant interferon-omega is effective in the treatment of parvoviral enteritis in dogs[32][33] and also inhibits replication of FPV in cell culture. So far no data are available on its efficacy in FPV-infected cats.

Complications

Cats typically die due to complications associated with sepsis, dehydration, and disseminated intravascular coagulopathy (DIC).[26] Leukocytopenia predisposes patients to secondary infections, especially bacterial and fungal, though secondary viral infections also occur.

It has been stated that cats with FPLV may be at risk for endocarditis or cardiomyopathy (since CPV-2 is a well-known cause of viral myocarditis in young puppies), but a 2017 retrospective study concluded that "Feline Panleukopenia Virus Is Not Associated With Myocarditis or Endomyocardial Restrictive Cardiomyopathy in Cats".[34]

Prognosis

Mortality in affected felid litters varies between 20 and 100%.[35] Mortality of FPLV is 25–90% in domestic cats with the acute form of the disease and up to 100% in cats with peracute disease.[26][36]

In 2010, a retrospective study of 244 infected cats showed that "leukocyte and thrombocyte counts as well as serum albumin and potassium concentrations at presentation are prognostic indicators in cats with panleukopenia, whereas vaccination status, age, clinical signs, and housing conditions are not."[19]

A survival rate of about 50% has been reported with supportive therapies.[37] Cats with FPLV that survive the first 5 days of treatment usually recover,[23] however the decrease in the cat's white blood cells compromises its immune system, leaving it vulnerable to secondary infection.[38]

Lifelong immunity is thought to follow recovery from disease, and a carrier state of the disease has never been identified.[12]

Preventing transmission from infected cats

Quarantine/isolation

Cats with suspected or diagnosed FPLV should be kept in isolation. This non-enveloped virus is very resistant to environmental conditions and many disinfectants, is highly contagious, and rapidly accumulates in the environment due to high shedding of virus from affected animals.[39] Strict protocols for containment – with isolation, minimal handling, and disinfection of all potential sources of fomites – is warranted. Recovered cats can still shed the virus for up to 6 weeks[4] and can carry it on their body for prolonged periods.

Vaccination

The practice of recommending and giving vaccines on a fixed schedule with annual boosters has been widely discarded. Current recommendations are based on the philosophy of vaccinating each cat no more frequently than necessary. These recommendations take into account considerations for the efficacy and longevity of each specific vaccine; the exposure, risk, and need of different cat populations; and socioeconomic limitations.[40][41][42][43]

Recommendations vary for:

  • animal shelters
  • boarding facilities (or animals going into them)
  • breeders
  • community cats (free-roaming and/or feral) or TNR (Trap Neuter Return) programs
  • owned pets (and based on "inside only" or "in and out")

The FPLV vaccination is considered a "core" (essential for health) vaccine and is recommended for all domestic cats.[40][44] Even cats kept indoors can be infected from fomite transmission.[45]

Several types and brands of commercial FPLV vaccines are available to induce acquired immunity. These include:

  • killed virus ("non-infectious"[40]) adjuvanted
  • killed virus non adjuvanted
  • modified-live virus (MLV or "infectious"[40]) adjuvanted
  • modified-live virus non adjuvanted

Combination vaccines that provide protection against several common viruses, including FPLV, are also available.

Selection or use of a specific type/brand of vaccine may vary depending on the overall risk of viral infection to the specific animal in its environment, along with considerations for the time it takes to confer protection, its overall efficacy, the animal's health, and the potential risks associated with MLV vs killed, adjuvanted vs non adjuvanted, intranasal/ocular vs injection.

Modified-live FPLV vaccines are not recommended in pregnant queens, very young kittens, or cats with FIV or FeLV.[46][40]

Kittens without maternally derived antibodies are especially vulnerable. FPLV vaccination can start as early as 4 weeks of age for kitten at high risk, but are usually started at 6 weeks, then given every 3 – 4 weeks until 16 weeks of age. For cats older than 16 weeks, 2 doses, 3 to 4 weeks apart is generally recommended, followed by a 6-month to 1-year booster.[41][40] Thereafter, a booster vaccination every 3 years is usually recommended;[47][40] a blood titer test can be done to determine individual antibody levels for catering the timing of boosters.

References

  1. ↑ "Genus: Protoparvovirus" (in en) (html). https://talk.ictvonline.org/ictv-reports/ictv_online_report/ssdna-viruses/w/parvoviridae/1045/genus-protoparvovirus. "Member species Species Virus name(s) Carnivore protoparvovirus 1 canine parvovirus CPV" 
  2. ↑ 2.0 2.1 "ICTV Taxonomy history: Carnivore protoparvovirus 1" (in en) (html). https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=20184273. 
  3. ↑ "Feline Panleukopenia Virus". NCBI. https://www.ncbi.nlm.nih.gov/mesh/68028301. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 "Overview of Feline Panleukopenia - Generalized Conditions". https://www.merckvetmanual.com/generalized-conditions/feline-panleukopenia/overview-of-feline-panleukopenia. 
  5. ↑ "Feline Panleukopenia". Merck Animal Health USA. https://www.merck-animal-health-usa.com/dp/29. 
  6. ↑ Marks, Stanley L. (2016). "Rational Approach to Diagnosing and Managing Infectious Causes of Diarrhea in Kittens". August's Consultations in Feline Internal Medicine, Volume 7. pp. 1–22. doi:10.1016/B978-0-323-22652-3.00001-3. ISBN 978-0-323-22652-3. 
  7. ↑ "Feline host range of canine parvovirus: recent emergence of new antigenic types in cats". Emerging Infectious Diseases 8 (4): 341–6. April 2002. doi:10.3201/eid0804.010228. PMID 11971764. 
  8. ↑ "Feline panleukopenia". American Veterinary Medical Association. https://www.avma.org/public/PetCare/pages/Feline-Panleukopenia.aspx. 
  9. ↑ Sykes, Jane E. (2014). "Feline Panleukopenia Virus Infection and Other Viral Enteritides". Canine and Feline Infectious Diseases. pp. 187–194. doi:10.1016/B978-1-4377-0795-3.00019-3. ISBN 978-1-4377-0795-3. 
  10. ↑ 10.0 10.1 Brooks, Wendy (2017-01-09). "Distemper (Panleukopenia) in Cats". Veterinary Partner. Veterinary Information Network, Inc.. https://www.vin.com/apputil/project/defaultadv1.aspx?pId=17256&SAId=1&catId=93555&id=4952250&ind=575&objTypeID=1007. 
  11. ↑ "Feline panleukopenia". ABCD CatsVets. 2015. http://www.abcdcatsvets.org/wp-content/uploads/2015/09/ABCD_FPV_V3_2015_for-web_final_170915.pdf. 
  12. ↑ 12.0 12.1 12.2 "Feline panleukopenia: A diagnostic laboratory's perspective". Veterinary Medicine 99 (8): 714–721. 2004-08-01. https://ucdavis.pure.elsevier.com/en/publications/feline-panleukopenia-a-diagnostic-laboratorys-perspective. 
  13. ↑ Dubovi, Edward J. (2017). "Parvoviridae". Fenner's Veterinary Virology. pp. 245–257. doi:10.1016/B978-0-12-800946-8.00012-X. ISBN 978-0-12-800946-8. 
  14. ↑ 14.0 14.1 "Feline Panleukopenia: Introduction". Whitehouse Station, New Jersey: Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc.. http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/57100.htm. 
  15. ↑ "Feline Panleukopenia Virus Infection and Other Viral Enteritides". Canine and Feline Infectious Diseases. 2014. pp. 187–194. doi:10.1016/B978-1-4377-0795-3.00019-3. ISBN 978-1-4377-0795-3. 
  16. ↑ "Detection of feline parvovirus in dying pedigree kittens". The Veterinary Record 142 (14): 353–6. April 1998. doi:10.1136/vr.142.14.353. PMID 9587196. 
  17. ↑ 17.0 17.1 17.2 17.3 17.4 17.5 17.6 Lappin, Michael (May 2013). "Update on the treatment of parvoviruses". https://amvac.ro/files/downloads/congres-2015/Michael_Lappin-Parvovirus_updates.pdf. 
  18. ↑ 18.0 18.1 18.2 "Prognostic factors in cats with feline panleukopenia". Journal of Veterinary Internal Medicine 24 (6): 1271–6. 2010. doi:10.1111/j.1939-1676.2010.0604.x. PMID 21039863. 
  19. ↑ 19.0 19.1 "Prognostic factors in cats with feline panleukopenia". Journal of Veterinary Internal Medicine 24 (6): 1271–6. 2010. doi:10.1111/j.1939-1676.2010.0604.x. PMID 21039863. 
  20. ↑ Karsten, Cynthia (April 2015). "Canine Parvo & Feline Panleuk: New ideas for prevention, treatment & risk assessment". https://www.uwsheltermedicine.com/library/resources/2015-cvc-washington-dc-conference-powerpoint-slides-for-dr-cynthia-karsten-s-presentations. 
  21. ↑ "Infectious Diseases of the Dog and Cat - 4th Edition". https://www.elsevier.com/books/infectious-diseases-of-the-dog-and-cat/greene/978-1-4160-6130-4. 
  22. ↑ 22.0 22.1 "Feline Panleukopenia". https://www.uwsheltermedicine.com/library/guidebooks/feline-panleukopenia/recognition-and-diagnosis. 
  23. ↑ 23.0 23.1 Sykes, Jane E. (2015). "Viral Infections". Small Animal Critical Care Medicine. pp. 504–508. doi:10.1016/B978-1-4557-0306-7.00096-9. ISBN 978-1-4557-0306-7. 
  24. ↑ 24.0 24.1 "FPV :: Hansen Dx". https://www.hansendx.com/products/fpv. 
  25. ↑ 25.0 25.1 25.2 25.3 "Feline panleukopenia. ABCD guidelines on prevention and management". Journal of Feline Medicine and Surgery 11 (7): 538–46. July 2009. doi:10.1016/j.jfms.2009.05.002. PMID 19481033. 
  26. ↑ 26.0 26.1 26.2 26.3 "Feline panleukopenie. Praxisrelevante fragen anhand eines fallbeispiels" (in German). Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere 30: 393–9. 2002. 
  27. ↑ "Feline panleukopenia |" (in en-GB). ABCD CatsVets. http://www.abcdcatsvets.org/abcd-guidelines-on-feline-panleukopenia-2012-edition/. 
  28. ↑ "Effect of early enteral nutrition on intestinal permeability, intestinal protein loss, and outcome in dogs with severe parvoviral enteritis". Journal of Veterinary Internal Medicine 17 (6): 791–8. 2003. doi:10.1111/j.1939-1676.2003.tb02516.x. PMID 14658714. 
  29. ↑ "Feline panleukopenia". Infectious diseases of the dog and cat. Philadelphia: WB Saunders. 2005. pp. 78–88. 
  30. ↑ "Treatment of dogs naturally infected with canine parvovirus with lyophilized canine IgG". Proceedings of the 17th Annual Conference of the American College of Veterinary Internal Medicine. June 10–13, 1999. 1999. 
  31. ↑ "Pathogenesis of canine parvovirus enteritis: sequential virus distribution and passive immunization studies". Veterinary Pathology 22 (6): 617–24. November 1985. doi:10.1177/030098588502200617. PMID 3001996. 
  32. ↑ "Treatment of canine parvoviral enteritis with interferon-omega in a placebo-controlled field trial". The Veterinary Record 152 (4): 105–8. January 2003. doi:10.1136/vr.152.4.105. PMID 12572939. 
  33. ↑ "Treatment of canine parvoviral enteritis with interferon-omega in a placebo-controlled challenge trial". Veterinary Microbiology 89 (2–3): 115–27. October 2002. doi:10.1016/S0378-1135(02)00173-6. PMID 12243889. 
  34. ↑ "Feline Panleukopenia Virus Is Not Associated With Myocarditis or Endomyocardial Restrictive Cardiomyopathy in Cats". Veterinary Pathology 54 (4): 669–675. July 2017. doi:10.1177/0300985817695516. PMID 28622497. 
  35. ↑ "Parvovirus Family Conundrum: What Makes a Killer?". Annual Review of Virology 2 (1): 425–50. November 2015. doi:10.1146/annurev-virology-100114-055150. PMID 26958923. 
  36. ↑ "Feline parvovirus infection and associated diseases". Veterinary Journal 201 (2): 150–5. August 2014. doi:10.1016/j.tvjl.2014.05.027. PMID 24923754. 
  37. ↑ "Clinical outcome of 73 cases with feline panleukopenia". Wiener Tierarztliche Monatsschrift 99 (9): 11–17. January 2012. https://www.researchgate.net/publication/287288814. 
  38. ↑ "Treatment Options for Feline Panleukopenia (Distemper)". VetInfo. http://www.vetinfo.com/feline-panleukepenia-treatment.html. 
  39. ↑ Burkholder, Tanya; Feliciano, Carmen Ledesma; Vandewoude, Sue; Baker, Henry J. (2015). "Biology and Diseases of Cats". Laboratory Animal Medicine. pp. 555–576. doi:10.1016/B978-0-12-409527-4.00013-4. ISBN 978-0-12-409527-4. 
  40. ↑ 40.0 40.1 40.2 40.3 40.4 40.5 40.6 "WSAVA Guidelines for the vaccination of dogs and cats". The Journal of Small Animal Practice 57 (1): E1–E45. January 2016. doi:10.1111/jsap.2_12431. PMID 26780857. 
  41. ↑ 41.0 41.1 "Feline Vaccination Advisory Panel Report | American Association of Feline Practitioners". https://catvets.com/guidelines/practice-guidelines/feline-vaccination-guidelines. 
  42. ↑ "The European Advisory Board on Cat Diseases (ABCD). Vaccines and vaccination.". http://www.abcdcatsvets.org/vaccines-and-vaccination-an-introduction/. 
  43. ↑ "UK National Office of Animal Health. Vaccination for animal health: an overview" (in en-GB). https://www.noah.co.uk/briefingdocument/vaccination-animal-health-overview/. 
  44. ↑ "2013 AAFP Feline Vaccination Advisory Panel Report". Journal of Feline Medicine and Surgery 15 (9): 785–808. September 2013. doi:10.1177/1098612x13500429. PMID 23966005. https://epub.ub.uni-muenchen.de/23815/1/oa_23815.pdf. 
  45. ↑ "Long-term immunity in cats vaccinated with an inactivated trivalent vaccine". American Journal of Veterinary Research 60 (5): 652–8. May 1999. PMID 10328440. 
  46. ↑ Karsten, Cynthia (April 2015). "Canine parovirus and feline panluekopenia: New ideas for prevention, risk assessment, and treatment (parts 1 & 2) (Proceedings)". http://veterinarycalendar.dvm360.com/canine-parovirus-and-feline-panluekopenia-new-ideas-prevention-risk-assessment-and-treatment-parts-1. 
  47. ↑ "Vaccination Guidelines for Dogs and Cats | School of Veterinary Medicine". https://www.vetmed.ucdavis.edu/hospital/animal-health-topics/vaccination-guidelines. 

External links

Wikidata ☰ Q1412127 entry




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