Infectious Diseases. What is an Infectious Disease?. Any disease that is caused by an agent that has invaded the body. These are caused by: Person to person contact Food and water Animals Something in the environment. Person to Person Contact. Sneezing Coughing Sharing Drinks.
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Inflammatory Response: reaction to injury or infection that is characterized by pain, redness, swelling.
If the pathogen makes it past your immune system and score a touchdown, you are now officially sick!