Norwalk viruses are highly contagious.

Cowpox viruses can cause skin lesions in humans.

Passenger viruses can sometimes hitch a ride with other viruses.

HIV viruses are a major concern in public health.

Corona viruses can cause respiratory illnesses.

Corona-viruses are a family of viruses that can cause illness in animals and humans.

Crown viruses are a group of viruses that have a crown-like appearance under an electron microscope.

Nipah viruses are highly contagious and can cause severe respiratory and neurological diseases.

The Chinese viruses have spread to multiple countries.

The China viruses are spreading rapidly.