Beginning Jan. 20, eligible individuals can book appointments for fourth doses online with AHS and participating pharmacies by using the Alberta vaccine booking system or by calling 811.

"With evidence showing immunocompromised individuals benefit from a fourth dose, we are pleased to provide them," said Premier Jason Kenney.

Chief medical officer of health Dr. Deena Hinshaw said individuals with certain immunocompromising conditions can benefit from a fourth COVID-19 vaccine dose. Those conditions include: transplant recipients, those with kidney disease on dialysis and those with advanced HIV infection. (A full list is at alberta.ca/vaccine.) Albertans can also book an appointment by calling 811 or participating pharmacies.

Youth ages 12 to 17 with the preceding conditions continue to be eligible for third doses. Fourth doses have not yet been approved for this age group. Third doses have not been approved for youth under the age of 18.