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Heartworm disease is caused by a worm that is carried by mosquitoes. Pets become infected when the mosquito bites and sucks blood. Once pets become infected with heartworms, the worms travel pulmonary vessels and lungs. Mature heartworms can be several inches long. As an adult, the heartworm is able to breed with other heartworms and produce microfilaria. These tiny microfilaria are picked up by blood-sucking mosquitoes and carried to other pets where the process begins again.


 

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