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Variola , the virus that causes smallpox , is spread from person to person through prolonged close contact . Women are most likely to get cervical cancer through infection by HPV , a group of viruses that causes warts and can be passed from person to person through sexual contact . Genital warts can be passed from person to person through intimate sexual contact ( vaginal , oral , or anal sex ) . AIDS is caused by the HIV virus , which is passed from person to person through sexual fluids , blood , or blood products , or from mother to unborn child in the womb or through breast-feeding . Pathogens may be transmitted from person to person through contaminated food .