There's not much profit in treating parasites, and profit funds research. Like bacterial infection (before the rise of resistant bugs), you treat a parasite wi

There's not much profit in treating parasites, and profit funds research. Like bacterial infection (before the rise of resistant bugs), you treat a parasite with a few doses and you're done. No more disease means no more revenue. So unless a really large fraction of the high income world gets a parasite, or the parasitism is chronically incurable, there's too little financial reward to justify studying or treating it.