HIV is able to enter a dormancy phase in certain infected cells for years. While dormant, antiretrovirals can't clear it out, because they only work on active viruses that are either trying to enter specific host cells or are replicating inside by hijacking the host cell's machinery.
It is possible the child could have been infected through drinking breast milk, but hopefully the mother wouldn't be that ****ing stupid.
If you want some better news, recent trials of zinc finger nuclease , which has the ability to disable one of the chemokine receptors that HIV attaches to on the outside of a CD4 cell, has shown promise.
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"When the Know-Nothings get control, it will read 'all men are created equal, except negroes, and foreigners, and Catholics.' When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy.”--Abraham Lincoln
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