昨天有一些正面的消息传出，墨西哥科学家说猪流感病毒的传染性并不比每年流行的季节性流感的传染性更大。
Some positive news surfaced yesterday: Mexican scientists said the contagiousness of the swine flu is no greater than that of the seasonal flu that circulates every year.
艾滋病病毒感染者有很强的传染性，是传播艾滋病最重要的传染源。
HIV-infected persons are highly infectious and is spread of AIDS, the most important source of infection.
禽流感是一种由病毒引起的，有传染性的动物传染病，通常只感染禽类，也可以感染猪。
Avian influenza is a contagious disease of animals caused by viruses that normally infect only birds and, less commonly, pigs.
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