Fill in the Blank
________occurs when an infected individual passes the infection on to other individuals, who pass it on to still others, increasing the penetration of the infection into the susceptible population.
A batch of food contaminated with botulism exotoxin, consumed at a family reunion by most of the members of a family, would be an example of a ________ outbreak.
A patient in the hospital with a urinary catheter develops a bladder infection. This is an example of a(n) ________ infection.