The head of Australia’s technical advisory body to the health minister has not ruled out changing the definition of what constitutes being fully vaccinated or “up to date” to four or five jabs. The chair for the Australian Technical Advisory Group on Immunisation (ATAGI), Nigel Crawford said that his organisation will continue to monitor data from other countries currently administering four doses at a Senate hearing on Feb. 16. ATAGI announced a change of definition for “fully vaccinated” from two doses to three doses on Feb. 10, and individuals yet to receive their third jab have six months’ to receive a booster. Crawford, however, said on Feb. 16 in front of the Senate Estimates committee that some immunocompromised patients have already been recommended four doses. Studies in the UK have shown that some immunocompromised patients do not have an adequate immune response to the virus with some activity only detected after the …