The first group of teachers those working in kindergartens and grades 1-3 have started getting AstraZeneca vaccine since Tuesday 16 February 2021. There has been some confusion over the efficacy of the AstraZeneca vaccine, because of a dosing mistake in one of the early trials. However, what is clear is that its efficacy with a standard, two-dose schedule is 62%.
In comparison, the efficacy of Pfizer/BioNTech’s vaccine is 95%, while interim results suggest the Novavax vaccine has an efficacy of 89%. These differences matter, because if vaccine efficacy is below a certain level, it is not possible to achieve herd immunity.
Most of the teachers who got the first shot of vaccine complain High fever, headaches, muscle aches, vomiting, dizziness and chills. The matter is being investigated by the Department of Health, concerned about the scale of the phenomenon. A serious question raises: Why teachers have to take AstraZeneca vaccine which is only 62% efficient? Why not Pfizer’s?