11) The answer is A: Escherichia coli K1. All of the agents l | Surgery videos & books

11) The answer is A: Escherichia coli K1. All of the agents listed can cause meningitis. The most common causes of meningitis in infants less than 1 month of age are E. coli K1, Group B Streptococcus, and Listeria monocytogenes. The clue to the identifi cation of E. coli as the etiologic agent is the fact that the organism grew on MacConkey agar—a selective medium for the growth of enteric, Gram-negative rods