THE Philippines got another boost in its vaccination efforts against the coronavirus disease 2019 (Covdi-19) with the arrival of 2.28 million doses of Pfizer-BioNTech Tozinameran from the global Covax facility on Thursday night. The vaccines will be used in the A1 to A3 priority groups, which consist of frontline healthcare workers, senior citizens, and persons with co-morbidities. According to Health Secretary Francisco Duque 3rd, it is.