Dr Khoo answered safety, long term efficacy, and proper distribution of the vaccines to protect enough people would be his concerns.
“Safety is a concern but I think public regulators are well-equipped to digest the data to see if it is safe for public use,” he said, and also admitted that researchers, too, still do not know how long immunity will last after people receive the vaccines.
Furthermore, as some of the vaccines have two-dose schedules to work above 90% efficacy, he said…