AIDs while changes genetics fast evading immune system its hard to catch and takes decades to show up. It took us 35 years to come up with a vaccine and that was due to our degree of knowledge of the immune system works at the time.
Now, we have something easier to catch than the flu that requires hospitalization to treat. Or in short words, myopic Trump is wrong; pushing for a World-Wide vaccination effort funded by the US is not only securing USa but securing the world.
This is the first case where we will have to pull together to vaccinate 7 billion people. Its not optional.
Any idea how many tons of steel to get 7 Billion new needles? It might be 5 million tons. That is about 5% US production or about less than 2% China production. But, the real costs is not in the needles. Its the logistic costs of trained medical personnel to deliver the vaccine.