The diseases were bad because the English were coming with disease which was bad because when one person got it pretty much everyone got it. In the summer of 1607 nearly half of the settlers died from disease. In total, nearly 130 people died from disease in total. I got this from documents (E/A/B)this just shows you that diseases were really bad back then and they couldn’t do anything about them.
They were also drinking very bad water that was polluted by feces that's why a