When referring to viruses, we do not use initial-caps, except when a proper name is involved. For example:
Commonly spread in pre-schools, coxsackie virus brings hand, foot and mouth disease to unfortunate children and their parents.
The Aedes mosquito can spread dengue virus, which causes dengue fever.
When considering insect repellent, weigh the perils of DEET against the perils of West Nile virus.
Who loves the influenza virus?
HIV/AIDS and hepatitis viruses can be spread sexually.
The prototypical norovirus is Norwalk virus.
What parent doesn't welcome a rotavirus vaccine?