What germs that cause communicable diases?

Germs that cause communicable diseases include bacteria, viruses, fungi, and parasites. Bacteria such as Streptococcus and Escherichia coli can lead to infections like strep throat and food poisoning. Viruses, including influenza and HIV, are responsible for illnesses ranging from the flu to AIDS. Fungi can cause diseases like athlete's foot, while parasites such as malaria and giardia can lead to severe health issues in humans.