DTP-Hib vaccine is given to check which disease (s) ? At which age, this vaccine is given?

Explanation

DTP-Hib vaccine is given to all infants of `1^(1//2),2^(1//2) and 3^(1//2)` months age to check diptheria, tetanus and pertusis (whooping cough) and Haemophilus influenzae type B.