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Dirofilaria Immitis, also known as heartworms. A parasitic roundworm that causes dirofilariasis. It is spread from host to host through the bites of infected mosquitoes. Heartworms are known to be common in dogs. However, in rare cases people can get heartworms after being bitten by an infected mosquito. Fortunately, humans are not a natural host for heartworms, the larvae usually migrates to the arteries and lungs and die before they become adult worms. 

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Dirofilaria Immitis, also known as heartworms. A parasitic roundworm that causes dirofilariasis. It is spread from host to host through the bites of infected mosquitoes. Heartworms are known to be common in dogs. However, in rare cases people can get heartworms after being bitten by an infected mosquito. Fortunately, humans are not a natural host for heartworms, the larvae usually migrates to the arteries and lungs and die before they become adult worms. 

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Five Symptoms of Heartworms, in dogs.
1.Lethargic
2.Difficulty breathing
3.Bulding ribs
4.Weight loss
5.Persistant Cough

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Treatment for heartworms can be expensive and time-consuming. They will typical need hospitalization to receive injections.
Preventing heartworms is key. Preventing them is simple and inexpensive. You can give them monthly or semi-annually prescription oral pills, that kill heartworms at the larvae stages and help prevent heartworms from infecting dogs. There is also liquid products put on there skin to help prevent heartworms.