A FATHER is fighting for his life after contracting three mosquito-borne illnesses from a single bite.

Joe Casey, 54, reportedly tested positive for Eastern equine encephalitis, West Nile and St. Louis encephalitis.

"He's my brother. It's very difficult, especially because it's from a mosquito," Casey's sister-in-law, Angela Barker told CBS affiliate WAFB.

"He was positive for EEE, for West Nile and St. Louis encephalitis, but the CDC or the infectious disease doctors, they don't know which one is making him this sick."

According to Barker, Casey first reported not feeling well early last month but was not admitted to the hospital until recently.

Barker told the outlet that doctors reported swelling in his brain which has rendered him unable to speak.

"My brother-in-law is not a small man, and to see someone that you love be as sick as he is and not be able to talk, to move, to communicate for over three weeks is terrifying and gut-wrenching," Barker said.

Despite the long road to recovery ahead of him, Casey's family remains optimistic for a full recovery.

Casey's family is now attempting to spread the word about his condition.

"He just got bit by a mosquito," his sister-in-law stated.

Be safe. Cover up. Wear bug spray. It can happen to anybody, and that's the scariest thing."

Last week, medical authorities announced that Stephen Perry, 41, had died after contracting the eastern equine encephalitis virus.

Officials in the Kensington neighborhood -- the area where both cases originated -- confirmed that one mosquito pool they had tested had come back positive for eastern equine encephalitis.

Authorities say that they have notified residents of the danger and raised the threat level to high.

The news of the two infected residents in the US comes as eight people across Europe have succumbed to the West Nile Virus.

Reports from Spain say that one of the victims was a 71-year-old resident of Coria del Río.

The person's death follows the death of a 71-year-old woman from Dos Hermanas, an 86-year-old woman infected in La Puebla del Río and an 87-year-old woman from Coria del Río.

West Nile is transmitted from the infected mosquitos to humans when they are bitten.

According to the ECDC, most cases of the illness occur between July and September and include symptoms like fever, body aches, vision loss and other noticeable changes.

Like the West Nile Virus, Eastern equine encephalitis and St. Louis encephalitis are also transferred to humans by infected mosquitos.

The CDC reports that both list fever, headache, vomiting, diarrhea, seizures, behavioral changes, and drowsiness as possible symptoms.