Isn’t all donated blood tested for HIV?
From my understanding, there is an initial cursory test for HIV. But it is a fact that there is an "occult" period after initial infection during which the virus is virtually undetectable.
In fact, the latest goal of HIV infected homosexuals is to get their viral load down to "undetectable levels."
Kind of horrifying, isn't it?
According to the CDC it can take up to 6 months for the disease to progress to the point its detectable using current tests. At that point the test is apparently 99% accurate.