This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Sereny test is positive for 
Select and explain. 
A. ETEC, B. EPEC, C. EIEC, D. EAEC
C: EIEC
Answer: C: EIEC 
Explanation: Sereny's test is positive in EIEC (Enteroinvasive E.coli). Ref: Textbook of microbiology; Ananthanarayan and paniker's; 10th Edition; Pg: 285