Carnivore protoparvovirus 1

Carnivore protoparvovirus 1 (CPPV 1) is a species of parvovirus that infects carnivorans. It causes a highly contageous disease in both dogs and cats. The disease is generally divided into two major genogroups: CPV-1 containing the classical feline panleukopenia virus (FPLV), and CPV-2 containing the canine parvovirus (CPV) which appeared in the 1970s.[2]

Carnivore protoparvovirus 1
Electron micrograph of canine parvovirus
Virus classification
(unranked): Virus
Realm: Monodnaviria
Kingdom: Shotokuvirae
Phylum: Cossaviricota
Class: Quintoviricetes
Order: Piccovirales
Family: Parvoviridae
Genus: Protoparvovirus
Species: Carnivore protoparvovirus 1
Member virus[1]

FPLV is known to infect all wild and domestic members of the felid (cat) family worldwide.[3] It is a highly contagious, severe infection that causes gastrointestinal, immune system, and nervous system disease. Its primary effect is to decrease the number of white blood cells, causing the disease known as feline panleukopenia.

It was once thought that only CPV-1 or FPLV infects cats.[4] However, it has been confirmed that a feline panleukopenia illness can be caused by CPV 2a, 2b, and 2c.[5][6]

FPLV is commonly referred to as:

  • feline infectious enteritis virus (FIE)[3]
  • feline parvovirus (FPV or FP or "feline parvo")[7]
  • feline parvoviral enteritis[3]

It is sometimes confusingly referred to as "cat plague" and "feline distemper".[8]

In addition to members of the felid family, it can also affect other carnivorans (e.g. raccoon, mink).[3]

Etymology

Formed within English using elements derived from Greek: pan- a combining form meaning "universal" or "worldwide", -leuco- a combining form meaning (in biologic sciences) "white blood cell", and -penia a combining form meaning "loss of" or "decrease of". Thus the word means universal loss of white blood cells. The universal part refers to both its worldwide distribution and to the fact that all species of cats are infected.[9]

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]

Antibodies against FPLV, produced by the adaptive immune system, play an important role in the feline 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 a subclinical infection or survive acute illness mount a robust, long-lasting, protective immune response.[3]

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.[3] 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.[3] 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]

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.[3] 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.[3] 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 varies by country but is 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 indicates 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 recombinant feline 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]

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[3] 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:

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

Selection or use of a specific type/brand of a 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 nonadjuvanted, 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 kittens 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" (html). International Committee on Taxonomy of Viruses (ICTV). Retrieved 8 January 2019. Member species Species Virus name(s) Carnivore protoparvovirus 1 canine parvovirus CPV
  2. Mira, F; Canuti, M; Purpari, G; Cannella, V; Di Bella, S; Occhiogrosso, L; Schirò, G; Chiaramonte, G; Barreca, S; Pisano, P; Lastra, A; Decaro, N; Guercio, A (29 March 2019). "Molecular Characterization and Evolutionary Analyses of Carnivore Protoparvovirus 1 NS1 Gene". Viruses. 11 (4). doi:10.3390/v11040308. PMID 30934948.
  3. "Overview of Feline Panleukopenia - Generalized Conditions". Merck Veterinary Manual. Retrieved 2019-03-09.
  5. Marks SL (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.
  6. Ikeda Y, Nakamura K, Miyazawa T, Takahashi E, Mochizuki M (April 2002). "Feline host range of canine parvovirus: recent emergence of new antigenic types in cats". Emerging Infectious Diseases. 8 (4): 341–6. doi:10.3201/eid0804.010228. PMC 2730235. PMID 11971764.
  7. "Feline panleukopenia". American Veterinary Medical Association.
  8. Sykes JE (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.
  9. Weiner, John; Simpson, J. A. (1989). The Oxford English Dictionary (2nd. ed.). Clarendon Press. ISBN 978-0198611868.
  10. Brooks W (2017-01-09). "Distemper (Panleukopenia) in Cats". Veterinary Partner. Veterinary Information Network, Inc.
  11. "Feline panleukopenia" (PDF). ABCD CatsVets. 2015.
  12. Brower AI, Radi C, Krueger D, Toohey-Kurth K (2004-08-01). "Feline panleukopenia: A diagnostic laboratory's perspective". Veterinary Medicine. 99 (8): 714–721.
  13. Dubovi EJ (2017). "Parvoviridae". In Dubovi EJ, Maclachlan NJ (eds.). Fenner's Veterinary Virology. pp. 245–257. doi:10.1016/B978-0-12-800946-8.00012-X. ISBN 978-0-12-800946-8.
  14. "Feline Panleukopenia: Introduction". Whitehouse Station, New Jersey: Merck Sharp & Dohme Corp., a subsidiary of Merck & Co., Inc. Retrieved 26 May 2011.
  15. Sykes JE (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.
  16. Addie DD, Toth S, Thompson H, Greenwood N, Jarrett JO (April 1998). "Detection of feline parvovirus in dying pedigree kittens". The Veterinary Record. 142 (14): 353–6. doi:10.1136/vr.142.14.353. PMID 9587196.
  17. Lappin M (May 2013). "Update on the treatment of parvoviruses" (PDF).
  18. Kruse BD, Unterer S, Horlacher K, Sauter-Louis C, Hartmann K (2010). "Prognostic factors in cats with feline panleukopenia". Journal of Veterinary Internal Medicine. 24 (6): 1271–6. doi:10.1111/j.1939-1676.2010.0604.x. PMID 21039863.
  19. Kruse BD, Unterer S, Horlacher K, Sauter-Louis C, Hartmann K (2010). "Prognostic factors in cats with feline panleukopenia". Journal of Veterinary Internal Medicine. 24 (6): 1271–6. doi:10.1111/j.1939-1676.2010.0604.x. PMID 21039863.
  20. Karsten C (April 2015). "Canine Parvo & Feline Panleuk: New ideas for prevention, treatment & risk assessment".
  21. "Infectious Diseases of the Dog and Cat - 4th Edition". www.elsevier.com. Retrieved 2019-03-09.
  22. "Feline Panleukopenia". University of Wisconsin Madison Shelter Medicine Program. Retrieved 2019-03-13.
  23. Sykes JE (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. "FPV :: Hansen Dx". www.hansendx.com. Retrieved 2019-03-13.
  25. Truyen U, Addie D, Belák S, Boucraut-Baralon C, Egberink H, Frymus T, Gruffydd-Jones T, Hartmann K, Hosie MJ, Lloret A, Lutz H, Marsilio F, Pennisi MG, Radford AD, Thiry E, Horzinek MC (July 2009). "Feline panleukopenia. ABCD guidelines on prevention and management". Journal of Feline Medicine and Surgery. 11 (7): 538–46. doi:10.1016/j.jfms.2009.05.002. PMC 7129762. PMID 19481033.
  26. Hartmann K, Hein J (2002). "Feline panleukopenie. Praxisrelevante fragen anhand eines fallbeispiels" [Feline panleukopenia. Practical questions based on a case study]. Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere (in German). 30: 393–9.
  27. "Feline panleukopenia |". ABCD CatsVets. Retrieved 2019-03-13.
  28. Mohr AJ, Leisewitz AL, Jacobson LS, Steiner JM, Ruaux CG, Williams DA (2003). "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. doi:10.1111/j.1939-1676.2003.tb02516.x. PMC 7166426. PMID 14658714.
  29. Greene CE, Addie DD (2005). "Feline panleukopenia". In Greene CE (ed.). Infectious diseases of the dog and cat. Philadelphia: WB Saunders. pp. 78–88.
  30. Macintire DK, Smith-Carr S, Jones R, Swango L (1999). 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.
  31. Meunier PC, Cooper BJ, Appel MJ, Lanieu ME, Slauson DO (November 1985). "Pathogenesis of canine parvovirus enteritis: sequential virus distribution and passive immunization studies". Veterinary Pathology. 22 (6): 617–24. doi:10.1177/030098588502200617. PMID 3001996.
  32. de Mari K, Maynard L, Eun HM, Lebreux B (January 2003). "Treatment of canine parvoviral enteritis with interferon-omega in a placebo-controlled field trial". The Veterinary Record. 152 (4): 105–8. doi:10.1136/vr.152.4.105. PMID 12572939.
  33. Martin V, Najbar W, Gueguen S, Grousson D, Eun HM, Lebreux B, Aubert A (October 2002). "Treatment of canine parvoviral enteritis with interferon-omega in a placebo-controlled challenge trial". Veterinary Microbiology. 89 (2–3): 115–27. doi:10.1016/S0378-1135(02)00173-6. PMID 12243889.
  34. McEndaffer L, Molesan A, Erb H, Kelly K (July 2017). "Feline Panleukopenia Virus Is Not Associated With Myocarditis or Endomyocardial Restrictive Cardiomyopathy in Cats". Veterinary Pathology. 54 (4): 669–675. doi:10.1177/0300985817695516. PMID 28622497.
  35. Kailasan S, Agbandje-McKenna M, Parrish CR (November 2015). "Parvovirus Family Conundrum: What Makes a Killer?". Annual Review of Virology. 2 (1): 425–50. doi:10.1146/annurev-virology-100114-055150. PMID 26958923.
  36. Stuetzer B, Hartmann K (August 2014). "Feline parvovirus infection and associated diseases". Veterinary Journal. 201 (2): 150–5. doi:10.1016/j.tvjl.2014.05.027. PMID 24923754.
  37. Wolfesberger B, Tichy A, Affenzeller N, Galler A, Shibly S, Schwendenwein I (January 2012). "Clinical outcome of 73 cases with feline panleukopenia". Wiener Tierarztliche Monatsschrift. 99 (9): 11–17.
  38. "Treatment Options for Feline Panleukopenia (Distemper)". VetInfo. Retrieved 30 May 2011.
  39. Burkholder T, Feliciano CL, Vandewoude S, Baker HJ (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. Day MJ, Horzinek MC, Schultz RD, Squires RA (January 2016). "WSAVA Guidelines for the vaccination of dogs and cats". The Journal of Small Animal Practice. 57 (1): E1–E45. doi:10.1111/jsap.2_12431. PMID 26780857.
  41. "Feline Vaccination Advisory Panel Report | American Association of Feline Practitioners". catvets.com. Retrieved 2019-03-13.
  42. "The European Advisory Board on Cat Diseases (ABCD). Vaccines and vaccination". Retrieved 2019-03-14.
  43. "UK National Office of Animal Health. Vaccination for animal health: an overview". NOAH (National Office of Animal Health). Retrieved 2019-03-14.
  44. Scherk MA, Ford RB, Gaskell RM, Hartmann K, Hurley KF, Lappin MR, Levy JK, Little SE, Nordone SK, Sparkes AH (September 2013). "2013 AAFP Feline Vaccination Advisory Panel Report" (PDF). Journal of Feline Medicine and Surgery. 15 (9): 785–808. doi:10.1177/1098612x13500429. PMID 23966005.
  45. Scott FW, Geissinger CM (May 1999). "Long-term immunity in cats vaccinated with an inactivated trivalent vaccine". American Journal of Veterinary Research. 60 (5): 652–8. PMID 10328440.
  46. Karsten C (April 2015). "Canine parovirus and feline panluekopenia: New ideas for prevention, risk assessment, and treatment (parts 1 & 2) (Proceedings)".
  47. "Vaccination Guidelines for Dogs and Cats | School of Veterinary Medicine". www.vetmed.ucdavis.edu. Retrieved 2019-03-13.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.