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Official Website

of the Commonwealth of Pennsylvania

    The .gov means its official.

    Local, state, and federal government websites often end in .gov. Commonwealth of Pennsylvania government websites and email systems use "pennsylvania.gov" or "pa.gov" at the end of the address. Before sharing sensitive or personal information, make sure you're on an official state website. 

    Infectious diseases are caused by germs that are harmful. The four different types of germs that cause infectious diseases are bacteria, viruses, fungi, and parasites. Infectious diseases can be spread from person to person, by animals or insects, by indirect contact, and through contaminated food, water, soil, or plants. Infectious diseases include: