This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
The characteristic features of E1 tor cholera are all except - 
Select and explain. 
A. More of subclinical cases, B. Mortality is less, C. Secondary attack rate is high in family, D. E1 tor vibrio is harder and able to survive longer
C: Secondary attack rate is high in family
Answer: C: Secondary attack rate is high in family 
Explanation: None