Aren't those things that you mention difficult to treat with modern, up to date, medicines? Those are viruses, right?
What you're saying is basically is that Native American medicine from years ago isn't clearly BETTER than today's medicine.
What natural things have anti-viral properties? Garlic maybe? Coconut oil maybe?
Expensive patented medicine doesn't have a lot of anti-virals the way there are are a lot of antibiotics.