Both strains quickly invaded local hospitals when needle sharing and other unhealthy practices ensured the rapid spreading of the infection by bringing people into contact with contaminated body fluids.
出自-2013年6月听力原文
By contacting contaminated body fluids
出自-2013年6月听力原文
Iced coffees sold by some popular chains are contaminated.
出自-2010年12月听力原文