Which of the following is true about BCG vaccination?

Which of the following is true about BCG vaccination? mcq given below:

Q. Which of the following is true about BCG vaccination?

(a) Distilled water is used as diluent
(b)The site of injection should be cleaned with spirit
(c) Mantoux test becomes positive after 48 hours of vaccination
(d) WHO recommended diminish 1331 strain for vaccine production

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Ans: (d) WHO recommended diminish 1331 strain for vaccine production

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