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Showing posts with label coronavirus. Show all posts
Showing posts with label coronavirus. Show all posts

Monday, April 2, 2012

Coronavirus in California shelter cats

Final report, Winn grant W10-036, a Bria Fund project
Molecular prevalence and viral load of replicating feline coronavirus in the bloodstream of healthy shelter cats in southern California
Investigators: Pedro Paulo Diniz, Yvonne Drechsler, Linda Kidd, Frank Bossong, Ellen Collisson; Western University of Health Science, Pomona, CA

Feline infectious peritonitis (FIP) remains a serious disease affecting cats, and while much remains unknown, research supported by Winn Feline Foundation is helping to shed light on this enigmatic disease. One of the major challenges of FIP is often the diagnosis; since a diagnosis of FIP is currently essentially a death sentence, accurate appraisal is vital. Unfortunately, the disease often presents with vague signs, and laboratory testing seldom offers any conclusive information. FIP is associated with feline coronavirus infection. However, the majority of cats infected with this virus never suffer any significant disease; thus, testing for the virus in suspected cases is also inconclusive, regardless of the result.

In order to better understand all parameters associated with disease production, these researchers wanted to examine characteristics of virus infection in otherwise healthy cats. Perhaps distinctions from those suffering from FIP could be identified to aid diagnosis. To do this, they assessed the amount of virus actually replicating in the blood of over 200 shelter cats in California.

Interestingly, they found that the incidence of actual replicating virus was quite low in the blood, even in cats that were actively shedding virus in their feces. The level of viral replication in cats with FIP is frequently fairly high, but in healthy cats, at least in the population tested by these investigators, actively replicating virus in the blood is quite low despite known infection. Thus, detecting high levels of replicating virus in the blood may be a useful diagnostic tool for FIP cases, and would allow distinction of harmless coronavirus infection from FIP. In order to validate these results, the investigators plan to test all cats for the presence of antibodies to the virus which would provide a picture of how prevalent infection, past or present, is among this population. [MK]

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Final report, Winn grant W10-036, a Bria Fund project
Molecular prevalence and viral load of replicating feline coronavirus in the bloodstream of healthy shelter cats in southern California
Investigators: Pedro Paulo Diniz, Yvonne Drechsler, Linda Kidd, Frank Bossong, Ellen Collisson; Western University of Health Science, Pomona, CA

Feline infectious peritonitis (FIP) remains a serious disease affecting cats, and while much remains unknown, research supported by Winn Feline Foundation is helping to shed light on this enigmatic disease. One of the major challenges of FIP is often the diagnosis; since a diagnosis of FIP is currently essentially a death sentence, accurate appraisal is vital. Unfortunately, the disease often presents with vague signs, and laboratory testing seldom offers any conclusive information. FIP is associated with feline coronavirus infection. However, the majority of cats infected with this virus never suffer any significant disease; thus, testing for the virus in suspected cases is also inconclusive, regardless of the result.

In order to better understand all parameters associated with disease production, these researchers wanted to examine characteristics of virus infection in otherwise healthy cats. Perhaps distinctions from those suffering from FIP could be identified to aid diagnosis. To do this, they assessed the amount of virus actually replicating in the blood of over 200 shelter cats in California.

Interestingly, they found that the incidence of actual replicating virus was quite low in the blood, even in cats that were actively shedding virus in their feces. The level of viral replication in cats with FIP is frequently fairly high, but in healthy cats, at least in the population tested by these investigators, actively replicating virus in the blood is quite low despite known infection. Thus, detecting high levels of replicating virus in the blood may be a useful diagnostic tool for FIP cases, and would allow distinction of harmless coronavirus infection from FIP. In order to validate these results, the investigators plan to test all cats for the presence of antibodies to the virus which would provide a picture of how prevalent infection, past or present, is among this population. [MK]

More on cat health:
Winn Feline Foundation Library
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Read the Cat Health News Weekly
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Monday, January 11, 2010

Characterization of FIP Mutants

Pederson N, Liu H, Dodd K, Pesavento P. Significance of coronavirus mutants in feces and diseased tissues of cats suffering from feline infectious peritonitis. Viruses. 2009;1(2):166-184.

This article describes viral characterization of the feline coronavirus found in feces versus diseased tissues of cats with feline infectious peritonitis (FIP). The researchers found that within a single cat, the viruses found in the intestinal tract and diseased tissue were almost 100% identical genetically. Minor differences were found in several of the genes of feline coronaviruses. Notably, the gene encoding a virus protein whose function remains unknown, the 3c protein, was almost always mutated in viruses found in FIP lesions. These mutations, while minor, are predicted to lead to a dysfunctional protein product. Viruses from the feces of these same cats however, almost always had intact, functional 3c genes. While the 3c mutation is not universal among FIP virus isolates, it does occur in the majority, and is speculated to play a significant role in FIP development. From this study, it also appears that the FIP mutants arose separately in each affected cat, rather than spreading cat-to-cat. Thus, horizontal transmission of FIP does not readily occur. More research into the function of the 3c gene product is needed to define its role in FIP. [MK]

Related articles:
Pedersen NC. A review of feline infectious peritonitis virus infection: 1963-2008. Journal of Feline Medicine & Surgery. 2009;11(4):225-258.

Vennema H, Poland A, Foley J, Pedersen NC. Feline infectious peritonitis viruses arise by mutation from endemic feline enteric coronaviruses. Virology. Mar 30 1998;243(1):150-157.

More on cat health: Winn Feline Foundation Library
Join us on Facebook
Follow us on Twitter
Pederson N, Liu H, Dodd K, Pesavento P. Significance of coronavirus mutants in feces and diseased tissues of cats suffering from feline infectious peritonitis. Viruses. 2009;1(2):166-184.

This article describes viral characterization of the feline coronavirus found in feces versus diseased tissues of cats with feline infectious peritonitis (FIP). The researchers found that within a single cat, the viruses found in the intestinal tract and diseased tissue were almost 100% identical genetically. Minor differences were found in several of the genes of feline coronaviruses. Notably, the gene encoding a virus protein whose function remains unknown, the 3c protein, was almost always mutated in viruses found in FIP lesions. These mutations, while minor, are predicted to lead to a dysfunctional protein product. Viruses from the feces of these same cats however, almost always had intact, functional 3c genes. While the 3c mutation is not universal among FIP virus isolates, it does occur in the majority, and is speculated to play a significant role in FIP development. From this study, it also appears that the FIP mutants arose separately in each affected cat, rather than spreading cat-to-cat. Thus, horizontal transmission of FIP does not readily occur. More research into the function of the 3c gene product is needed to define its role in FIP. [MK]

Related articles:
Pedersen NC. A review of feline infectious peritonitis virus infection: 1963-2008. Journal of Feline Medicine & Surgery. 2009;11(4):225-258.

Vennema H, Poland A, Foley J, Pedersen NC. Feline infectious peritonitis viruses arise by mutation from endemic feline enteric coronaviruses. Virology. Mar 30 1998;243(1):150-157.

More on cat health: Winn Feline Foundation Library
Join us on Facebook
Follow us on Twitter
Read More