Bogota, June 18 : Colombia's vaccine advisory committee recommended a second Covid-19 booster dose for people aged 12-49, but only under medical order, Health Minister Fernando Ruiz said. The second booster shot, or a fourth vaccine dose, is currently available for immunocompromised people, those with transplants and comorbidity, as well as seniors over 50 years old, reports Xinhua news agency. "The committee of experts recommended continuing the application of the third dose (first booster) to cover populations that have not received it, and maintaining the fourth dose for the population with comorbidity," Ruiz said. The Minister urged older adults and children to complete their vaccination schedule, since those that are not immunised are at the greatest risk. According to the latest Health Ministry data, the South American country has registered 13,810 new Covid-19 cases and 24 deaths in the last week, bringing the totals to 6,131,657 and 139,918, respectively. /IANS