H5N1 appears to have expanded its host range, infecting and killing mammalian species previously considered resistanttoinfection with avian influenza viruses.
H5N1病毒似乎扩大了宿主范围，导致以往被视为对禽流感病毒具有抵抗力的哺乳类动物的感染和死亡。
2
The chemical also kills s. aureus biofilms, which are a common cause of infection on implanted catheters and other medical devices and are notoriously resistantto the actions of antibiotics.
Once the infection - caused by one of the bacteria most often resistantto antibiotics - had been diagnosed, doctors put him on five different antibiotics.