system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The characteristic features of El tor cholera are all except
assistant
The correct answer is  Ans. is 'c' i.e., Secondary attack rate is high in family El Tor vibrio . It is much hardier than classical vibrios, capable of surviving in the environment much longer. . The severity of illness is much less, with a large propoion of mild and asymptomatic infections. . Moality is low and the carrier rate is high. . Fewer secondary cases in affected families (secondry attack rate is less) - Park