Cholera is caused by-
Vibrio cholerae is sero-grouped on the basis of 'O' antigen into several 'O' serogroups. Of these, O1 and O139 produce the cholera toxin. Hence cholera is caused by only these 2 serogroups ( as only that enteritis is called cholera which is due to cholera toxin )
V.cholerae O1
V.cholerae O1 and O139
V. cholerae O139
NAG vibrios
Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli)