AstraZeneca defends reduced vaccine supply, says ’it isn’t like building houses’

After coming under EU fire for reduced Covid-19 vaccine supply, AstraZeneca defended itself saying it was is due to a technical issue. The company said making vaccines isn’t like building houses, where one can add a few more bricks to a wall if it’s too short. It’s a biological process and impossible to ascertain how much vaccine is going to be made once production starts, as yield varies.