To be fair though, think about getting the flu without access to clean water or decent food. When you're vomiting several times a day, it's necessary to stay h

To be fair though, think about getting the flu without access to clean water or decent food. When you're vomiting several times a day, it's necessary to stay hydrated. If you live in a place without a steady supply of clean water, you're kind of screwed and dehydration is a very big risk. Looking at the symptoms of malaria, fever, vomiting, and diarrhea are all problems. Before the modern era I could see that being very dangerous.