Back to today’s briefing

Story perspectives

Heartworm Disease Surge Threatens Pets in Southeast USA

1/19/2026

50 11

Summary

Story summary

Heartworm disease is caused by Dirofilaria immitis.
It is transmitted by various mosquito species.
The southeastern United States and the Mississippi River Valley have the highest prevalence.
The disease has increased over the past decade, affecting many shelter dogs in these areas.
Heartworms can infect cats and, in rare cases, humans, and testing and prevention are crucial for pet health.

1 of 1

Story summary

Heartworm disease is caused by Dirofilaria immitis.
It is transmitted by various mosquito species.
The southeastern United States and the Mississippi River Valley have the highest prevalence.
The disease has increased over the past decade, affecting many shelter dogs in these areas.
Heartworms can infect cats and, in rare cases, humans, and testing and prevention are crucial for pet health.