Seroprevalence of Dirofilaria immitis in canines from animal shelters in the Colombian coffee region (Eje Cafetero)

In Colombia, there are reports of approximately 6.4 million pets, making this the fourth country in Latin America and leading the pet sector with an annual growth of 13%. This study aimed to determine the seroprevalence of Dirofilaria immitis, a parasitic nematode, in 170 canines from the municipalities of Pereira, Santa Rosa de Cabal, and La Virginia, located in the department of Risaralda and the municipalities of Calarca and Armenia in the department of Quindio. A cross-sectional study was carried out on canines from animal shelters during the period 2021–2022. Blood samples were taken, and in vitro immunochromatography was performed to detect specific lesions for Dirofilaria immitis. A peripheral blood smear confirmed positive patients, and a chest x-ray was performed to show changes in the morphology of the heart and blood vessels. Seroprevalence was determined by calculating proportions with the 95% confidence interval determined by the exact or Clopper-Pearson method for a proportion based on sample size and the number of positive cases. The seroprevalence of the test for Dirofilaria immitis was 0.62% (95% CI = 0.016–3.42%). This parasite is a nematode of low distribution in areas of the coffee region. However, surveillance programmes that help control and reduce its transmission should be established.