PrepTest 74, Section 2, Question 15
Researcher: Salmonella bacteria are a major cause of illness in humans who consume poultry. Young chicks that underwent a new treatment exhibited a lower incidence of Salmonella infection than did untreated chicks, although one week after the treatment was administered the treated chicks had higher concentrations of a variety of bacteria than did untreated chicks.
Researcher: Salmonella bacteria are a major cause of illness in humans who consume poultry. Young chicks that underwent a new treatment exhibited a lower incidence of Salmonella infection than did untreated chicks, although one week after the treatment was administered the treated chicks had higher concentrations of a variety of bacteria than did untreated chicks.
Researcher: Salmonella bacteria are a major cause of illness in humans who consume poultry. Young chicks that underwent a new treatment exhibited a lower incidence of Salmonella infection than did untreated chicks, although one week after the treatment was administered the treated chicks had higher concentrations of a variety of bacteria than did untreated chicks.
Researcher: Salmonella bacteria are a major cause of illness in humans who consume poultry. Young chicks that underwent a new treatment exhibited a lower incidence of Salmonella infection than did untreated chicks, although one week after the treatment was administered the treated chicks had higher concentrations of a variety of bacteria than did untreated chicks.
Which one of the following, if true, most helps to explain the concentrations of bacteria one week after the treatment?
The new treatment takes several weeks to administer.
Levels of Salmonella bacteria in young chicks are generally not high to begin with.
Most chicks develop resistance to many harmful bacteria by the time they reach adulthood.
The untreated chicks experienced a higher incidence of illness from infection by bacteria other than Salmonella than did treated chicks.
The bacteria found in the treated chicks were nonvirulent types whose growth is inhibited by Salmonella bacteria.
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