Infectious diseases in cat shelters

DiGangi BA, Levy JK, Griffin B, et al. Prevalence of serum antibody titers against feline panleukopenia virus, feline herpesvirus 1, and feline calicivirus in cats entering a Florida animal shelter. J Am Vet Med Assoc. 2012; 241: 1320-5.
 
Feline panleukopenia virus (FPV), feline herpes virus 1 (FHV-1), and feline calicivirus (FCV) are widespread in the cat population, and particularly in shelter environments. The American Association of Feline Practitioners guidelines recommend that all cats at or over 4 weeks of age be vaccinated against these three viruses upon admission to animal shelters. However, the proportion of cats entering shelters that are already protected (i.e., seropositive) against infection (FPV) or disease (FHV-1 and FCV) because of prior vaccination or natural exposure is usually unknown. The objective of this study was to determine the prevalence of and factors associated with seropositivity for FPV, FHV-1, and FCV in cats entering a Florida animal shelter.

Of 347 cats enrolled in this study, prevalence of seropositivity was 39.8%, 11.0% and 36.6% against FPV, FHV-1, and FCV, respectively. Factors associated with seropositivity included sterilization, age equal to or greater than 6 months, and relinquishment by an owner. Surprisingly, community origin (i.e., rural or urban), health status, signs of previous caregiving aside from sterilization, and outcome (i.e., adopted, transferred, euthanized, or reclaimed by owner) were not associated with seropositivity and should not be used to determine an individual cat’s need for vaccination. This study suggests that most cats admitted to an animal shelter do not have adequate antibody protection against infection or disease; therefore, the recommendation to vaccinate all cats admitted to an animal shelter is reasonable and vaccination should not be withheld due to signs of previous veterinary care. [GO]

See also: DiGangi BA, Gray LK, Levy JK, Dubovi EJ and Tucker SJ. Detection of protective antibody titers against feline panleukopenia virus, feline herpesvirus-1, and feline calicivirus in shelter cats using a point-of-care ELISA. J Feline Med Surg. 2011; 13: 912-8.

Related blog articles:
Upper respiratory tract disease in shelters (November 2009)
Disease control in animal shelters (May 2011)
Coronavirus in California shelter cats (April 2012)

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DiGangi BA, Levy JK, Griffin B, et al. Prevalence of serum antibody titers against feline panleukopenia virus, feline herpesvirus 1, and feline calicivirus in cats entering a Florida animal shelter. J Am Vet Med Assoc. 2012; 241: 1320-5.
 
Feline panleukopenia virus (FPV), feline herpes virus 1 (FHV-1), and feline calicivirus (FCV) are widespread in the cat population, and particularly in shelter environments. The American Association of Feline Practitioners guidelines recommend that all cats at or over 4 weeks of age be vaccinated against these three viruses upon admission to animal shelters. However, the proportion of cats entering shelters that are already protected (i.e., seropositive) against infection (FPV) or disease (FHV-1 and FCV) because of prior vaccination or natural exposure is usually unknown. The objective of this study was to determine the prevalence of and factors associated with seropositivity for FPV, FHV-1, and FCV in cats entering a Florida animal shelter.

Of 347 cats enrolled in this study, prevalence of seropositivity was 39.8%, 11.0% and 36.6% against FPV, FHV-1, and FCV, respectively. Factors associated with seropositivity included sterilization, age equal to or greater than 6 months, and relinquishment by an owner. Surprisingly, community origin (i.e., rural or urban), health status, signs of previous caregiving aside from sterilization, and outcome (i.e., adopted, transferred, euthanized, or reclaimed by owner) were not associated with seropositivity and should not be used to determine an individual cat’s need for vaccination. This study suggests that most cats admitted to an animal shelter do not have adequate antibody protection against infection or disease; therefore, the recommendation to vaccinate all cats admitted to an animal shelter is reasonable and vaccination should not be withheld due to signs of previous veterinary care. [GO]

See also: DiGangi BA, Gray LK, Levy JK, Dubovi EJ and Tucker SJ. Detection of protective antibody titers against feline panleukopenia virus, feline herpesvirus-1, and feline calicivirus in shelter cats using a point-of-care ELISA. J Feline Med Surg. 2011; 13: 912-8.

Related blog articles:
Upper respiratory tract disease in shelters (November 2009)
Disease control in animal shelters (May 2011)
Coronavirus in California shelter cats (April 2012)

More on cat health:
Winn Feline Foundation Library
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Parvovirus in cats and dogs

Stucker KM, Pagan I, Cifuente JO, et al. The role of evolutionary intermediates in the host adaptation of canine parvovirus. J Virol 2012;86:1514-1521.

Canine parvovirus (CPV-2) emerged in the late 1970’s as a variant of feline panleukopenia virus (FPV). By the early 1980’s, this variant was replaced by new variants that infected both dogs and cats (CPV-2a and -2b). Interestingly, it is now believed that raccoons may have played a role in the evolution of FPV and its adaptation to dogs, and re-adaptation to cats. Through analysis of all of these viruses and variants, the researchers were able to describe the complex sequence of events, involving small changes in the virus were necessary for these changes in host adaptations. Furthermore, they found that these changes had to occur in concert with one another in order for the adaptation to be successful. These findings show how complex this adaptation to new hosts is, and thus why it is not a common occurrence among viruses. [MK]

Related articles: Horiuchi M, Yamaguchi Y, Gojobori T, et al. Differences in the evolutionary pattern of feline panleukopenia virus and canine parvovirus. Virology 1998;249:440-452.

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Stucker KM, Pagan I, Cifuente JO, et al. The role of evolutionary intermediates in the host adaptation of canine parvovirus. J Virol 2012;86:1514-1521.

Canine parvovirus (CPV-2) emerged in the late 1970’s as a variant of feline panleukopenia virus (FPV). By the early 1980’s, this variant was replaced by new variants that infected both dogs and cats (CPV-2a and -2b). Interestingly, it is now believed that raccoons may have played a role in the evolution of FPV and its adaptation to dogs, and re-adaptation to cats. Through analysis of all of these viruses and variants, the researchers were able to describe the complex sequence of events, involving small changes in the virus were necessary for these changes in host adaptations. Furthermore, they found that these changes had to occur in concert with one another in order for the adaptation to be successful. These findings show how complex this adaptation to new hosts is, and thus why it is not a common occurrence among viruses. [MK]

Related articles: Horiuchi M, Yamaguchi Y, Gojobori T, et al. Differences in the evolutionary pattern of feline panleukopenia virus and canine parvovirus. Virology 1998;249:440-452.

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Cats and Viruses

Hellard E, Fouchet D, Santin-Janin H et al: When cats' ways of life interact with their viruses: a study in 15 natural populations of owned and unowned cats (Felis silvestris catus), Preventive Veterinary Medicine 101:250, 2011.

Cats are susceptible to a number of important viruses that can cause significant disease. The living conditions and behavior of various cat populations will affect their susceptibility and risk of exposure to these viruses. The investigators examined 15 populations of non-sterilized unvaccinated cats living in the same area of France. These populations had one of two different lifestyles – owned (sheltered and fed, socialized) and unowned (no shelter or food provided, unsocialized). Blood samples were tested for exposure of the cats to feline herpesvirus (FHV), calicivirus (FCV), parvovirus (FPV), immunodeficiency virus (FIV), and leukemia virus (FeLV). Not surprisingly, the unowned cats were more likely to have been infected with FHV, FCV, and FIV – these viruses largely require direct contact between cats, including fighting. The owned cats were more likely to have been infected with FPV. For each virus, the likelihood of having been infected varied with the population. For example, FIV infection was more likely in older, male, unowned cats; FHV was more likely to infect kittens at an earlier age in unowned versus owned populations; FPV infection was more likely in owned populations perhaps because of shared environments in human settlements. The main crux of this paper was that the epidemiology of a particular virus within cat populations can be affected by their behavior and lifestyle. Failure to consider these aspects can skew results of epidemiologic analyses. For example, when the status of the owned and unowned cats were combined, a different epidemiologic picture was seen for the various viruses examined – the risk factors were different, and included such factors as body mass. Pooling different types of cats in a single sample without taking behavior and lifestyle into account could give a misleading picture of the epidemiology of their viruses. [MK]

Related articles: Pontier D, Fouchet D, Bahi-Jaber N et al: When domestic cat (Felis silvestris catus) population structures interact with their viruses, C R Biol 332:321, 2009.

More on cat health: Winn Feline Foundation Library
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Hellard E, Fouchet D, Santin-Janin H et al: When cats' ways of life interact with their viruses: a study in 15 natural populations of owned and unowned cats (Felis silvestris catus), Preventive Veterinary Medicine 101:250, 2011.

Cats are susceptible to a number of important viruses that can cause significant disease. The living conditions and behavior of various cat populations will affect their susceptibility and risk of exposure to these viruses. The investigators examined 15 populations of non-sterilized unvaccinated cats living in the same area of France. These populations had one of two different lifestyles – owned (sheltered and fed, socialized) and unowned (no shelter or food provided, unsocialized). Blood samples were tested for exposure of the cats to feline herpesvirus (FHV), calicivirus (FCV), parvovirus (FPV), immunodeficiency virus (FIV), and leukemia virus (FeLV). Not surprisingly, the unowned cats were more likely to have been infected with FHV, FCV, and FIV – these viruses largely require direct contact between cats, including fighting. The owned cats were more likely to have been infected with FPV. For each virus, the likelihood of having been infected varied with the population. For example, FIV infection was more likely in older, male, unowned cats; FHV was more likely to infect kittens at an earlier age in unowned versus owned populations; FPV infection was more likely in owned populations perhaps because of shared environments in human settlements. The main crux of this paper was that the epidemiology of a particular virus within cat populations can be affected by their behavior and lifestyle. Failure to consider these aspects can skew results of epidemiologic analyses. For example, when the status of the owned and unowned cats were combined, a different epidemiologic picture was seen for the various viruses examined – the risk factors were different, and included such factors as body mass. Pooling different types of cats in a single sample without taking behavior and lifestyle into account could give a misleading picture of the epidemiology of their viruses. [MK]

Related articles: Pontier D, Fouchet D, Bahi-Jaber N et al: When domestic cat (Felis silvestris catus) population structures interact with their viruses, C R Biol 332:321, 2009.

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Feline Panleukopenia

Kruse BD, Unterer S, Horlacher K, et al. Prognostic factors in cats with feline panleukopenia. J Vet Intern Med 2010;24:1271-1276.

Feline panleukopenia is a highly contagious and frequently lethal disease affecting all members of the cat family. Clinical disease can range from subclinical infection to a peracute form with sudden death. The more typical signs include fever, lethargy, and loss of appetite. Cats may present with vomiting and develop watery to bloody diarrhea. Patients die from complications that arise from secondary bacterial infections, sepsis, dehydration, and disseminated intravascular coagulation. The cats most affected and at risk of death are kittens up to the age of 12 months. This study looked at potential prognostic factors for survival of cats with panleukopenia. The medical records of 244 cats were evaluated retrospectively. In this study, indoor cats were more commonly affected than outdoor cats, and 14.5% had no contact with other cats indicating that indirect transmission is an important mode of transmission. Transmission can occur by means of contaminated clothing, cages, and insect vectors. The survival rate amongst this group of cats was 51.1%. Age, living conditions, and clinical signs were not associated with illness severity and outcome. It was noted that leukocyte and thrombocyte counts as well as serum albumin and potassium concentrations did represent prognostic factors in feline panleukopenia. Also, vaccination protocols that do not include vaccination of kittens beyond 12 weeks of age may not be adequate to prevent panleukopenia.  [VT]

Related articles:
Truyen U, Addie D, Belak S, et al. Feline panleukopenia ABCD guidelines on prevention and management. J Feline Med Surg 2009;11:538-546.

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Kruse BD, Unterer S, Horlacher K, et al. Prognostic factors in cats with feline panleukopenia. J Vet Intern Med 2010;24:1271-1276.

Feline panleukopenia is a highly contagious and frequently lethal disease affecting all members of the cat family. Clinical disease can range from subclinical infection to a peracute form with sudden death. The more typical signs include fever, lethargy, and loss of appetite. Cats may present with vomiting and develop watery to bloody diarrhea. Patients die from complications that arise from secondary bacterial infections, sepsis, dehydration, and disseminated intravascular coagulation. The cats most affected and at risk of death are kittens up to the age of 12 months. This study looked at potential prognostic factors for survival of cats with panleukopenia. The medical records of 244 cats were evaluated retrospectively. In this study, indoor cats were more commonly affected than outdoor cats, and 14.5% had no contact with other cats indicating that indirect transmission is an important mode of transmission. Transmission can occur by means of contaminated clothing, cages, and insect vectors. The survival rate amongst this group of cats was 51.1%. Age, living conditions, and clinical signs were not associated with illness severity and outcome. It was noted that leukocyte and thrombocyte counts as well as serum albumin and potassium concentrations did represent prognostic factors in feline panleukopenia. Also, vaccination protocols that do not include vaccination of kittens beyond 12 weeks of age may not be adequate to prevent panleukopenia.  [VT]

Related articles:
Truyen U, Addie D, Belak S, et al. Feline panleukopenia ABCD guidelines on prevention and management. J Feline Med Surg 2009;11:538-546.

More on cat health: Winn Feline Foundation Library
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Response to Vaccinations in Cats

Lappin, M. R., J. Veir, et al. (2009). "Feline panleukopenia virus, feline herpesvirus-1, and feline calicivirus antibody responses in seronegative specific pathogen-free cats after a single administration of two different modified live FVRCP vaccines." Journal of Feline Medicine & Surgery 11(2): 159-162.

Researchers at Colorado State University evaluated the antibody response of cats to a single inoculation of one of two modified live vaccines containing feline panleukopenia virus (FPV), feline herpesvirus (FHV) and feline calicivirus (FCV). These pathogens commonly infect cats, and some cats at greatest risk, such as those in shelters or pet stores, may suffer severe disease, or even death. In these situations, rapid onset of immunity following vaccination is needed. The investigators sought to determine the timing of seroconversion in 10 seronegative cats following a single vaccination with either an intranasal vaccine or one given subcutaneously (both are commercially available vaccines). This study had limitations, in that the number of cats tested were small, and protection was evaluated by antibody levels only. In addition, the cats tested were adults not kittens; thus, the ability to break through maternal immunity could not be evaluated. Nevertheless, results were informative. While all cats developed detectable FPV and FCV antibody titers; only two cats developed detectable FHV-1 antibody titers indicating two vaccinations are required for adequate protection. For FPV and FHV-1, there were no differences in seroconversion rates between the cats that were given the intranasal versus the injectable vaccine. However, for FCV, the cats that were administered the IN FVRCP vaccine were more likely to seroconvert earlier than cats that were administered the injectable vaccine. These results suggest that the FVRCP vaccine administered IN should be considered in populations of FCV naive cats with high risk of exposure. [MK]
>> PubMed Abstract

Related articles:
Lappin, M. R., R. W. Sebring, et al. (2006). "Effects of a single dose of an intranasal feline herpesvirus 1, calicivirus, and panleukopenia vaccine on clinical signs and virus shedding after challenge with virulent feline herpesvirus 1." J Feline Med Surg 8(3): 158-63.
>> PubMed Abstract

Lappin, M. R., J. Andrews, et al. (2002). "Use of serologic tests to predict resistance to feline herpesvirus 1, feline calicivirus, and feline parvovirus infection in cats." J Am Vet Med Assoc 220(1): 38-42.
>> PubMed Abstract

More on cat health: Winn Feline Foundation Library

Lappin, M. R., J. Veir, et al. (2009). "Feline panleukopenia virus, feline herpesvirus-1, and feline calicivirus antibody responses in seronegative specific pathogen-free cats after a single administration of two different modified live FVRCP vaccines." Journal of Feline Medicine & Surgery 11(2): 159-162.

Researchers at Colorado State University evaluated the antibody response of cats to a single inoculation of one of two modified live vaccines containing feline panleukopenia virus (FPV), feline herpesvirus (FHV) and feline calicivirus (FCV). These pathogens commonly infect cats, and some cats at greatest risk, such as those in shelters or pet stores, may suffer severe disease, or even death. In these situations, rapid onset of immunity following vaccination is needed. The investigators sought to determine the timing of seroconversion in 10 seronegative cats following a single vaccination with either an intranasal vaccine or one given subcutaneously (both are commercially available vaccines). This study had limitations, in that the number of cats tested were small, and protection was evaluated by antibody levels only. In addition, the cats tested were adults not kittens; thus, the ability to break through maternal immunity could not be evaluated. Nevertheless, results were informative. While all cats developed detectable FPV and FCV antibody titers; only two cats developed detectable FHV-1 antibody titers indicating two vaccinations are required for adequate protection. For FPV and FHV-1, there were no differences in seroconversion rates between the cats that were given the intranasal versus the injectable vaccine. However, for FCV, the cats that were administered the IN FVRCP vaccine were more likely to seroconvert earlier than cats that were administered the injectable vaccine. These results suggest that the FVRCP vaccine administered IN should be considered in populations of FCV naive cats with high risk of exposure. [MK]
>> PubMed Abstract

Related articles:
Lappin, M. R., R. W. Sebring, et al. (2006). "Effects of a single dose of an intranasal feline herpesvirus 1, calicivirus, and panleukopenia vaccine on clinical signs and virus shedding after challenge with virulent feline herpesvirus 1." J Feline Med Surg 8(3): 158-63.
>> PubMed Abstract

Lappin, M. R., J. Andrews, et al. (2002). "Use of serologic tests to predict resistance to feline herpesvirus 1, feline calicivirus, and feline parvovirus infection in cats." J Am Vet Med Assoc 220(1): 38-42.
>> PubMed Abstract

More on cat health: Winn Feline Foundation Library

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Fecal Parvovirus Testing in Cats

Neuerer, F. F., K. Horlacher, et al. (2008). "Comparison of different in-house test systems to detect parvovirus in faeces of cats." Journal of Feline Medicine & Surgery 10(3): 247-251.

Feline panleukopenia virus (FPV) is a common infection of domestic cats. The disease is highly contagious and associated with significant morbidity and mortality, especially in kittens. The virus is highly resistant and can survive up to 1 year in infected organic material. Clinical signs in cats are variable and leukopenia is not always present at the time of presentation. In-house tests for the detection of fecal canine parvovirus and/or FPV antigen for use in veterinary practice have become available. The close structural and antigenic relation of FPV and canine parvoviruses offers the possibility to test cats for FPV with the same test kit used for dogs. This study was designed to evaluate the strength and weaknesses of 5 commercial tests and to assess their sensitivity, specificity, and predictive values. In total, 200 fecal samples from randomly selected healthy cats (148) and cats with diarrhea (52) were tested and compared with the results of examination by electron microscopy. Ten cats were positive for FPV and all of these had diarrhea. All tests were suitable to screen cats for fecal parvovirus excretion. In-house parvovirus tests may be positive up to 2 weeks after vaccination, and therefore, in recently vaccinated cats positive results do not necessarily mean infection.
>> PubMed abstract

Related articles:
Patterson, E. V., M. J. Reese, et al. (2007). "Effect of vaccination on parvovirus antigen testing in kittens." J Am Vet Med Assoc 230(3): 359-63.
>> PubMed abstract

More on cat health: Winn Feline Foundation Library

Neuerer, F. F., K. Horlacher, et al. (2008). "Comparison of different in-house test systems to detect parvovirus in faeces of cats." Journal of Feline Medicine & Surgery 10(3): 247-251.

Feline panleukopenia virus (FPV) is a common infection of domestic cats. The disease is highly contagious and associated with significant morbidity and mortality, especially in kittens. The virus is highly resistant and can survive up to 1 year in infected organic material. Clinical signs in cats are variable and leukopenia is not always present at the time of presentation. In-house tests for the detection of fecal canine parvovirus and/or FPV antigen for use in veterinary practice have become available. The close structural and antigenic relation of FPV and canine parvoviruses offers the possibility to test cats for FPV with the same test kit used for dogs. This study was designed to evaluate the strength and weaknesses of 5 commercial tests and to assess their sensitivity, specificity, and predictive values. In total, 200 fecal samples from randomly selected healthy cats (148) and cats with diarrhea (52) were tested and compared with the results of examination by electron microscopy. Ten cats were positive for FPV and all of these had diarrhea. All tests were suitable to screen cats for fecal parvovirus excretion. In-house parvovirus tests may be positive up to 2 weeks after vaccination, and therefore, in recently vaccinated cats positive results do not necessarily mean infection.
>> PubMed abstract

Related articles:
Patterson, E. V., M. J. Reese, et al. (2007). "Effect of vaccination on parvovirus antigen testing in kittens." J Am Vet Med Assoc 230(3): 359-63.
>> PubMed abstract

More on cat health: Winn Feline Foundation Library

Read More