EITor vibrio may be differentiated from classical vibrio by fact that EITor vibrio -

Ans. is 'd' i.e., All of the above El Tor vibrio o It is much hardier than classical vibrios, capable of surviving in the environment much longer. o The severity of illness is much less, with a large propoion of mild and asymptomatic infections. o Moality is low and the carrier rate is high. o Fewer secondary cases in affected families (secondry attack rate is less) - Park