Source: Texas A&M University
A new genomic study has revealed that canine heartworm disease has a far older and more complex history than previously believed. Rather than spreading only through modern dog movement, evidence suggests the parasite, Dirofilaria immitis, evolved alongside ancient canids and human migration over thousands (or even millions) of years.
Using whole-genome sequencing of samples from across multiple continents, researchers identified clear genetic differences between regional heartworm populations. These patterns indicate the parasite’s global distribution likely predates recent human activities such as colonization and trade. For example, Australian heartworms are closely related to Southeast Asian strains, aligning with early human and dingo migration, while North American strains may have existed before European arrival.
The findings are significant for modern Veterinary medicine, as understanding heartworm evolution and genetic diversity can help track disease spread and detect drug resistance. Despite these insights, researchers emphasize that prevention, testing, and further study remain essential.