Abstract
BackgroundCanine heartworm disease is a potentially fatal disease for which treatment is financially burdensome for many pet owners. Prevention is strongly advocated by the veterinary community along with routine testing for infection during annual wellness examinations. Despite the availability of efficacious chemoprophylaxis, recent reports have suggested that the incidence of heartworm disease in domestic dogs is increasing.ResultsUsing data from tests for heartworm infection in the USA from January 2012 through September 2018, a Bayesian spatio-temporal binomial regression model was used to estimate the regional and local temporal trends of heartworm infection prevalence. The area with the largest increase in regional prevalence was found in the Lower Mississippi River Valley. Regional prevalence increased throughout the southeastern states and northward into Illinois and Indiana. Local (county-level) prevalence varied across the USA, with increasing prevalence occurring along most of the Atlantic coast, central United States, and western states. Clusters of decreasing prevalence were present along the Mississippi Alluvial Plain (a historically endemic area), Oklahoma and Kansas, and Florida.ConclusionsCanine heartworm infection prevalence is increasing in much of the USA, both regionally and locally, despite veterinarian recommendations on prevention and testing. Additional steps should be taken to protect dogs, cats and ferrets. Further work is needed to identify the driving factors of the locally decreasing prevalence present along the Mississippi Alluvial plain, Florida, and other areas.
Highlights
Canine heartworm disease is a potentially fatal disease for which treatment is financially burdensome for many pet owners
All tests rely on the detection of protein antigens from sexually mature, adult female D. immitis worms in the blood of infected dogs
In the present study, we investigated the changes in canine heartworm infection prevalence from early 2012 through late 2018 at two spatial scales
Summary
Canine heartworm disease is a potentially fatal disease for which treatment is financially burdensome for many pet owners. Despite the availability of efficacious chemoprophylaxis, recent reports have suggested that the incidence of heartworm disease in domestic dogs is increasing. Over 100,000 dogs in the USA are diagnosed with heartworm infection annually [1]. To a lesser extent, cats are screened routinely for D. immitis infection, providing millions of data points annually for estimating the prevalence of infection over time. Since these data started being reported in the early 2000s, the national prevalence of heartworm infections in dogs has changed little. Bowman and colleagues surveyed clinics throughout the USA and estimated prevalence of 1.4% for the years 2001 through 2007 [3].
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