The United States funds research into medicines and treatments for conditions that people in the United States have. We do it in the form of direct government support for research, and also in the form of high royalties paid to drug and medical companies. Most other countries don't spend nearly as much on medical research. They "free-ride" on the advances that US companies make. For example, a lot of medicines that are expensive in the US are distributed in India at a very low cost that would not allow the drug companies to recoup their research investments.
How about some gratitude for the advances that we've already made, and the billions that people like Bill Gates are already giving to the third world?
The politics of envy and blame is an ugly thing. If we work together, perhaps we can arrive at a real solution like wiping out the particular mosquito species that carries malaria (before you post, no, I don't mean all mosquitos... just that one).