Exactly man, crooked doctors do not do their own research, because they it is beyond their "pay time"--but the Science is there, which they criminally ignore. As you sucggest, mucus scraping is a practice that the best of the parasitologists did, but now every body becoming a gastro specialists, it has been abandoned, relying on flawed stool tests and their "golden blood tests"; as result, people who are deadly ill are left to die, assuming that something is wrong with their mind!
This is why we need to demand clinical minds, not doctors who have become psychologists! They are criminals agaist scinece.