ATAGI released their statement on the 24/12/21 on the Omicron variant and the timing of the COVID-19 booster vaccination.
Immunocompromised individuals who have received 3 primary doses of a COVID-19 vaccine are also recommended to have a booster dose in line with the timing for the general population, i.e., currently a 4-month interval from their primary course, and when capacity permits, 3 months.