queensland health confirms there 's a shortage of whooping cough vaccine .
there is an insufficient supply of a booster which is used for adults .
medical professionals insist the shortage will not affect immunisation program for babies , children and pregnant women .
it 's australia 's least well-controlled of all vaccine-preventable diseases .
riley hughes died in a perth hospital at just 32 days old on march 17 .
his parents are campaigning for adults to vaccinate themselves and their children to avoid other preventable infant deaths .
whooping cough is ` highly infectious ' and lethal in babies .
immunisation against it is available for children from two months old .