Common disease-carrying viruses include venereal viruses, cold viruses and blood-borne pathogens that trigger hepatitis. Genital herpes, which is caused the herpes simplex virus, is contagious in nature, notes the United States National Institutes of Health.
Patients who develop a cold have an infected upper respiratory system, which is due to an invasion of microorganisms called viruses. Some of the most common viral strains among the more than 200 species that cause the common cold include the rhinovirus, coronavirus, respiratory syncytial virus and parainfluenza virus, states WebMD.
Sexual activity can result in the transmission of diseases that are viral in origin. Getting infected with the human immunodeficiency virus, or HIV, may lead to a more serious condition known as acquired immunodeficiency syndrome, or AIDS.
Blood-borne pathogens that damage the liver include hepatitis A virus, hepatitis B virus and hepatitis C virus. Patients may also develop viral hepatitis due to sexual intercourse.