There are three categories of germs (as microscopical organisms that cause diseases): bacteria, virus and fungus. But within each category, there are many, many different types.
Hope that answers your question. 😉 If you want more details, let me know and I’ll expand the answer! 😉
There is no accurate count on how many types there is. Germs evolve and so more kinds will become active almost every day. We do not have the resources to count them all, keep track and find the new kinds that have just came into existence.
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