Comfortis and Trifexis brands treat adult fleas on pets; the latter also prevents heartworm disease. The prognosis for feline heartworm disease is guarded. An antibody test is also available for feline heartworm infection. Diagnosis of heartworm infection in cats is problematic. It is a known vector of La Crosse encephalitis and canine heartworm disease. Because of this, differences between canine and feline heartworm diseases are significant. If a dog is bitten, the heartworm preventive takes over when administered. Prevention of heartworm infection can be obtained through a number of veterinary drugs. In dogs it is routinely used as prophylaxis against heartworm. Other parasites, like "Anisakis" and heartworm can also infect sea lions. Vectra 3-D was tested using thousands of mosquitoes infected with the resistant heartworm strain JYD34. Acute heartworm disease in cats can result in shock, vomiting, diarrhea, fainting, and sudden death. DEC is also used to prevent heartworm in dogs. Red Dog is suspected of having heartworm and has treatment for it. These are usually one of the above drugs combined with a heartworm prevention drug.