The crossword solution for the term 'Nasty Virus' is 'Ebola'. Ebola is a virus that was first identified in 1976 near the Ebola River in what is now the Democratic Republic of Congo. It is a severe, often fatal illness in humans and can cause fever, intense weakness, muscle pain, headache and sore throat. It can also cause vomiting, diarrhea, rash, impaired kidney and liver function, and in some cases, both internal and external bleeding. The virus is spread through contact with bodily fluids of an infected person or animal. There is currently no cure for Ebola, but treatments are available to help manage symptoms and improve the chances of survival.