translation.en: This worked well for most pathogens, somewhat well for crafty bugs like flu, but not at all for HIV, for which humans have no natural immunity.
translation.zh: 这个可以对付大多数的病原体， 即使是一些狡诈的病原体，像流感病毒。 但是对付艾滋病毒就不行了。 因为人类对艾滋病毒没有天然的免疫性。