SINGAPORE : Singapore has authorised the use of the Pfizer-BioNTech COVID-19 vaccine for those aged 12 to 15 years old in a bid to extend protection to more groups as the country tackles a recent increase of infections, officials said on Tuesday."The data showed that the Pfizer-BioNTech COVID-19 vaccine demonstrated high efficacy consistent with that observed in the adult population," the health ministry said in a statement, adding "its safety profile is also consistent with the known safety profile in the adult population".The government will also extend the interval between two-dose COVID-19 vaccines to six to eight weeks, from three to four weeks currently, it said.Never miss a story!