Vaccine: /vækˈsin or, especially Brit., ˈvæksin, -sɪn/ [vak-seen or, especially Brit., vak-seen, -sin]
a substance made from the germs that cause a disease which is given to people to prevent them getting the disease
---->> Being vaccine is important for children to prevent smallpox.
Human papillomavirüs: /ˌpæpəˈloʊməˌvaɪrəs/ [pap-uh-loh-muh-vahy-ruhs]
any of several viruses of the family Papovaviridae, containing circular DNA, causing papillomas in various animals and responsible for human genital warts.
---->> Human papillomavirus is one example of a cancer-causing infection.