Explanation: Cato the Elder was an ultraconservative of the mid-Republic era, and he was extremely disdainful and paranoid about anything new or foreign - like Greeks. Of especial concern was Greek thought and medicine, which horrified the traditionalist Cato - who believed that most ailments could be cured by eating cabbage. As seen by the quote here - an actual quote from Cato - he believed that Greek doctors were conspiring to kill outsiders, like the good, honest, Roman people, who didn't need none of that fancy book-learnin' medicine!
Like many other ultraconservative outbursts he had in his life, Cato the Elder was largely ignored on the issue, and Greek medicine formed the foundation for later Roman medical practice.