Merck originally had the patten, it never ran out MERCK dropped it. I Believe ivermectin would put all cold & flue meds out of business and almost every disease caused by virus. When gov. saw what it did, they cut a deal with MERCK I believe. Merck was allowed to send it to Africa to treat only RIVER Blindness (Parasitic) to recoup cost if they said it was only for parasites. CDC website, its being tested to treat cancer NOW. If you can stop cancer cells replication it's basically a cure, THEY fool people using the word growth, but growth is replication.