Describe three examples of human diseases caused by viruses. Solution The three examplesof human diseases caused by viruses are: 1.Flu Influenza which causes respiratory illness due to the virus.It spreads through coughing. 2.Herpes:This is caused by the herpes simplex virus and is a sexually transmitted disease. 3.Human immunodefieciency virus/AIDS: which is caused by a spread of virus.