title: Prevalence of Dirofilaria immitis infection among shelter cats.
abstract: OBJECTIVE
  To determine prevalence of Dirofilaria immitis infection among shelter cats.
  
  
  METHODS
  Cross-sectional study.
  
  
  METHODS
  239 cats euthanatized at an animal shelter in southeastern Michigan.
  
  
  METHODS
  A gross necropsy focusing on the thoracic cavity, heart, lungs, and pulmonary vessels was performed within 5 hours after cats were euthanatized. Blood was collected directly from the heart of cats found to be infected and tested, using a filter test for microfilariae. Serum was tested for D immitis antigens by use of 2 antigen detection kits and for D immitis-specific antibodies by use of 2 antibody detection kits.
  
  
  RESULTS
  Cats ranged from approximately 4 months to 15 years old. Adult D immitis were found in 6 (2.5%) cats. Blood could not be recovered from 1 of the cats with heartworm infection. For the 5 other cats, results of the filter test were negative, and results of both antigen and both antibody tests were positive.
  
  
  CONCLUSIONS
  Results suggest that cats living in an urban area in the northern part of the United States have a low prevalence of adult D immitis infection. However, this is likely to be an underestimate of the true prevalence of infection, because no attempts were made to identify cats infected with larval or juvenile stages of D immitis.
authors.affiliation: PC Veterinary Practice, St Clair, MI 48079, USA.
authors.forename: M
authors.initials: M
authors.lastname: Hermesmeyer
authors.forename: R K
authors.initials: RK
authors.lastname: Limberg-Child
authors.forename: A J
authors.initials: AJ
authors.lastname: Murphy
authors.forename: L S
authors.initials: LS
authors.lastname: Mansfield
mesh_terms: D000818:Animals; D000909:Antibodies, Helminth / Q000097:blood; D000947:Antigens, Helminth / Q000097:blood; D002371:Cat Diseases / Q000453:epidemiology*; D002415:Cats; D003430:Cross-Sectional Studies; D004183:Dirofilaria immitis / Q000276:immunology; D004184:Dirofilariasis / Q000453:epidemiology*; D005065:Euthanasia / Q000706:statistics & numerical data / Q000662:veterinary; D005260:Female; D008297:Male; D008824:Michigan / Q000453:epidemiology; D015995:Prevalence; D016036:Seroepidemiologic Studies
chemical_list: D000909:Antibodies, Helminth; D000947:Antigens, Helminth