For adults, a second booster dose will be offered to high-risk individuals aged between 18 to 59 and frontline health workers. “Those who are 12 to 17-years-old who have been certified as moderately or severely immunocompromised can get the third dose 28 days after their second dose. “Immunocompromised youths aged 12 to 17 are also eligible to get their first booster dose three months after their third dose. “Those who are eligible for the CanSino booster dose are individuals aged 18 years and older who have received a primary dose of the Covid-19 vaccine other than CanSino and Sinovac,” he said. The CanSino booster will be given at least three months after receiving the second dose of the primary vaccine.