<Tr> <Th_colspan="2"> (what is this?) (verify) </Th> </Tr> <P> DPT (also DTP and DTwP) refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough), and tetanus . The vaccine components include diphtheria and tetanus toxoids and killed whole cells of the bacterium that causes pertussis (wP). </P> <P> DTaP and Tdap refer to similar combination vaccines in which the component "P" or "p" with lower case "a" is acellular . </P> <P> Also available are the DT and Td vaccines, which lack the pertussis component . </P>

What is the difference between dtp and tdap