Viruses cause disease by directly destroying living cells or by affecting cellular processes in ways that upset homeostasis. These include the common cold, influenza, AIDS and HIV, chicken pox, Hepatitis B, West Nile Virus, and HPV. Influenza includes body aches, dry cough, fatigue, and congestion. AIDS and HIV destroys helper T-cells. Hepatitis B includes jaundice, abdominal pain, nausea and vomiting. West Nile is similar to influenza without the cough and congestion. HPV includes genital warts or cancer of the reproductive organs.