From January 10 onwards, fully vaccinated healthcare and frontline workers as well as people above the age of 60 years with co-morbidities can register for their 'precaution doses' or booster shots. For those aged 60 and above with co-morbidities, the booster shot will be given on doctor's advice. However, the booster dose can only be taken nine months after the administration of the second dose, the government statement said.