Covid, common cold, AIDS and influenza are caused by viruses.
The following are some of the human diseases:
Tetanus, mumps, cholera, syphilis, typhoid, small pox, influenza, AIDS and herpes. Among these the number of diseases caused by viruses is
How many strains of viruses are responsible for causing common cold in man?
What are the most common means by which diseases such as common cold and influenza spread?