West Nile Virus
It was first found out in 1937 in Uganda, Africa.
There are rarely symptoms if you have a strong immune system, but some can if they don't have strong enough immune system. The symptoms are fever, headache, body aches, drowsiness, nausea, vomiting, and diarrhea. There are less common once when its bad like swollen Lymph Glands, skin rashes on chest, stomach, and backs. Those are the only symptoms West Nile has to offer.
Whenever you go outside wear bug repellant and the best type is one that say deet. If you get bit it doesn't mean you have West Nile Virus, but if you get bit by a infected mosquito and you get the symptoms you could have West Nile.
There is no cure for West Nile, but a aspirin, pain relief, or ibuprofen is recommended.