What Causes Heartworm Disease?

causes disease heartworm
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What Causes Heartworm Disease?

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Mosquitoes spread heartworm disease. Animals infected by heartworms have millions of baby heartworms (microfilaria) in their blood. When a mosquito bites an infected animal, microfilaria enters its mouth. While living in the mosquito the heartworm becomes a larva, which is passed to an animal when bitten by the mosquito. The larvae are then deposited under the skin of the animal.

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