A variety of microorganisms can cause disease. Pathogenic organisms are of five main types: viruses, bacteria, fungi, protozoa, and worms. Some common pathogens in each group are listed in the column on the right.
Fever-reducing medicine such as acetaminophen (Tylenol) or ibuprofen (Advil orMotrin) is one of the simplest and most effective ways to bring down a fever.
