Fred99:
The trial involved 30,000 people in the US with half being given two doses of the vaccine, four weeks apart. The rest had dummy injections.
The analysis was based on the first 95 to develop Covid-19 symptoms.
Only five of the Covid cases were in people given the vaccine and 90 were in those given the dummy treatment. The company says the vaccine is protecting 94.5 percent of people.
I was listening to an expert from one of the companies (I forget which one) a few weeks ago talking about the trials.It was interesting to hear them talk about one of the big problems they have which is probably going to exist with all the trials, and that is people are actually working out if they have had the placebo or not.
There are minor to mild side effects in all the current big pharma vaccines ranging from muscle soreness to mild fever and pains that are occurring in most people who are receiving the vaccine. As a result people involved in the trial can have a fairly good idea if they have received the vaccine or placebo, and the concern is that the behaviors of these two groups then differ with placebo groups taking greater precautions in their day to day life. It seems pretty clear now that the vaccines do work, but establishing actual efficiency rates may take a lot more work still.