Today, early results from a study of a potential vaccine against COVID-19 were published. The study included 45 healthy adults, 18 to 55 years of age, who had the new vaccine at one of three doses (low, medium and high). It was given as two vaccinations 28 days apart. These early results showed that the vaccine did cause a positive immune (protective) response against COVID-19. However there were negative side effects including chills, headache, muscle aches, and pain at the injection site. Side effects were more common after the second vaccination, especially with the highest dose. This is only the beginning, and we need more research to work out the most effective dose with the fewest side effects. We also need to research whether the vaccine will work in people with greatest risk, particularly older people in whom the immune response may be less than in younger people. The speed with which this vaccine has been developed is remarkable, but more work needs to be done. We also need to be careful as the COVID-19 virus is unpredictable.


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