I want to know the answer to the following question:
What causes Streptococci?
All the background I'm provided with is that "Nonetheless, the dramatic decrease in deaths from infectious diseases that occurred prior to World War II was primarily the result of improved public health measures such as clean water and less crowded housing, and the impact of anti-infective drugs and vaccines was significant mainly after World War II.". Is that enough to answer the question?
Answer: no