Intervets guidlines are on the link further up the page P`/nurse, I already gave you links for boosters have you not read them?  Email intervet direct & ask them, theeir guidlines are what vets should be following if they use their vacs. It`s not a 3yr booster, the vaccine given LASTS for 3yrs at least for parvo/distemper & not sure what/if else.

Christine, Spain.