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Heartworm - A Deadly DiseaseThe Cycle
A dog becomes infected with heartworm when bitten by a mosquito carrying the immature worms, called microfilariae. The microfilariae travel through the dog's bloodstream for about 6 months. During this time they mature into adult worms before reaching their final destination -- the dog's heart.
http://www.dogparlor.com/article1110.html
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