This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
Phage typing is useful as an epidemiological tool in all, except - 
Select and explain. 
A. Salmonella, B. Staph aureus, C. V. Cholerae, D. Shigella dysenteriae
D: Shigella dysenteriae
Answer: D: Shigella dysenteriae 
Explanation: Phages that lyse all the members of genus salmonella species ,Bacillus anthracis and subspecies classical vibrio cholerae. The most impoant application of phage typing is for intraspecies typing of bacteria as in the ohage typing of S.typhi and staphylococci. REF:ANANTHANARAYAN AND PANIKER'S TEXTBOOK OF MICROBIOLOGY 9TH EDITION PAGE NO:459