According to Matangi Tonga, the ministry is in a race against time to inoculate 13,738 teenagers with the Pfizer vaccine before the doses it has in stock expire in 28 days time.
At least 1,097 people aged 12-17 years old have received their first dose of the Pfizer vaccine since it arrived last week.
The vaccine roll-out continues to secondary and middle schools on Tongatapu this week.
Meanwhile, a vaccination team will travel to 'Eua on Wednesday to start vaccination at schools there, before going to other islands groups next week.