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1Listeria monocytogenes causes over 2,500 illnesses annually in the United States. If it was isolated in two cases, would epidemiological studies be required to determine if the two cases are related?
A)Yes, epidemiological studies would be required to differentiate between two organisms of the same species and formulate an epidemiological explanation.
B)No, simply identifying the bacterial species responsible for the outbreak would be enough to formulate an epidemiological explanation.



2If the phage types of isolates are identical, and a connection exists between the isolates, the chances are great that they are epidemiologically related.
A)True
B)False



3Two suspensions containing two different phages were accidentally mixed, and then a single drop of the mixed suspension was placed onto an agar plated swabbed with bacteria. If, after 24 hours a plaque appeared, could you use that data to determine what strain the bacteria belong to?
A)Yes, you could assume both phages helped make the plaque.
B)No, you wouldn’t know which phage caused the plaque.



4A S. aureus culture was susceptible to phage types 7, 54, and 77. To which lytic group does this strain of S. aureus belong?
A)I
B)II
C)III
D)IV



5If the species of bacteria in a series of case studies is unknown, then phage typing would not be an effective way to formulate an epidemiological explanation.
A)True
B)False







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