expand the following-
(a)OPV (b)ORS (c)AIDS (d)BCG

A. Oral Polio Vaccine
B. Oral Rehydration Solution
C. Acquired Immuno Deficiency Syndrome
D. Bacillus Calmette Guerin

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opv oral polio vaccines
ors oral rehydration solutions
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aids acquire immune deficiency syndrome
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Bacille de Calmette et Guérin (or BCG) is a vaccine against tuberculosis that is prepared from a strain of the attenuated  live bovine tuberculosis bacillus.​
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