bacteria - single-celled microorganisms that are treated with antibiotics , viruses - smallest pathogens than must live within another cell; some can be treated with antivirals or prevented with vaccines, helminths - parasites that are worms- example:hookworms, Rickettsiae - bacteria found in lice, ticks, fleas, etc., protozoa - single-cell animal-like organisms commonly found in surface waters, can cause dysentery or malaria, among other illnesses, fungi - plant-like organism; yeasts and molds; examples: ringworm and athlete's foot , anaerobic pathogens - do not need oxygen, aerobic organisms - need oxygen, parasite - an organism that must have a host to survive, MRSA - Methicillin-resistant staphylococcus arreous, KPC - caused bacteria to mutate and become resistant to antibiotics, endogenous infection - originates inside the body, like the flu, exogenous infection - originates outside the body, like cancer, opportunistic infection - infection likely to affect a vulnerable population like the elderly, babies, and cancer patients, nosocomial, HAI - infections that are spread in health facilities,

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