Covid-19 vaccine trials, which are currently ongoing in various parts of the world.The development comes under the backdrop of scrutiny and questions raised to the vaccine producer about its Covid-19 vaccine trials since two participants in the UK reported illness earlier this month.AstraZeneca’s 111-page trial blueprint, known as a protocol, states that its goal is a vaccine with 50 percent effectiveness — the same threshold that the US Food and Drug Administration has set in its guidance for coronavirus vaccines.
To determine with statistical confidence whether the company has met that target, there will have to be 150 people ill with confirmed coronavirus among participants who were vaccinated or received placebo shots.A safety board.