According to the World Health Organization, at least 30 new dangerous infectious diseases have emerged in the last 20 years - diseases like SARS, Ebola, and H1N1 ("bird flu.")
Nhlangano wa Worldwatch Institute wu vike leswaku emalembeni ya 30 lama hundzeke, "mavabyi yo tlula 30 lama a ma nga tiviwi enkarhini lowu hundzeke yo tanihi Ebola, HIV, Hantavirus ni ya SARS ma tekiwe tanihi lama nga ni khombo swinene."