With HIV the virus basically highjacks the patient
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I’m pretty sure Covid-19 doesn’t enter T-Cells and hence acts in a completely different manner and a vaccine is possible.
I’m not saying a vaccine for HIV is impossible but it would have to stop the virus from entering billions of CCR5 receptors and not miss one of them to be effective. This is why some people with the CCR5-Delta32 T-Cells mutation are immune to HIV.