Oral cholera vaccine is effective for: September 2005: (A) 6 months, (B) 12 months, (C) 2 years, (D) 3 years
Answer is D. Ans. D: 3 years Oral vaccine is effective for at least 3 years. Injectable vaccine is effective for 3-6 months and protective value is about 50%. Proguanil and antibiotics should be avoided from one week before and one week after the administration of the live oral attenuated vaccine