Covid, this is what changes after the administration of a vaccine or a placebo – Corriere.it

The Food and Drug Administration on Tuesday released data on the safety and efficacy of Moderna’s coronavirus vaccine, which has been shown to work very well to prevent Covid-19 infections. Modern is one step away from licensing and will become the second licensed vaccine in the United States. Pfizer vaccines already started last week in both the United States and the United Kingdom. Both have been shown to be around 94% effective in preventing disease. Business Insider Comparison Two graphs clearly show the differences between the population that received the vaccine or the placebo.

The Modern vaccine

Moderna’s graph shows how well the 15,000 volunteers who received the vaccine (red line) protected themselves compared to the other 15,000 who were instead injected with placebo (a substance that has no effect based on water and salt) visible in the blue line, the vaccine Modern It seems start protecting people from infection 14 after the first dose. It was not possible to assess how protection would evolve with a single dose because study participants were injected with the second dose after 28 days. In the group of those vaccinated, only eleven cases of Covid-19 (none serious) were registered after the double dose had time to take effect (14 days after the administration of the second vaccine). In the control group (those who took placebo, but without knowing it), during the same study period (two months), 185 people became ill with Covid-19 (19 severe, one death). The side effects found in the study were generally mild, but still 17% of the participants experienced headache, fever, pain, in some cases lasting two to three days. In particular, the most serious side effects affected the group of volunteers under 65 years of age.