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If that's the case, the defective strain might be used to make a vaccine: Healthy people would be exposed to the defective virus so that they could produce antibodies, chemicals that would protect them from more dangerous HIV strains.
Nonetheless, Fauci says, the Australian group's work shows definitively that one of the avenues to long-term nonprogression is infection with a defective virus.
Because the delta virus that causes delta hepatitis is a defective virus, meaning it cannot replicate on its own, it needs a "helper" virus--i.