The Pfizer COVID-19 vaccine works well in the big real world test
A real-world test of Pfizer’s COVID-19 vaccine in more than half a million people confirms that it is very effective at preventing serious illness or death, even after one dose.
Results from a mass vaccination campaign in Israel, released on Wednesday, strongly confirm that the benefits of smaller, more limited tests persisted as the vaccine was used much more frequently in a general population of different ages and health conditions.
The vaccine was 92% effective in preventing serious illnesses after two shots and 62% after one. The estimated death prevention effectiveness was 72% two to three weeks after the first shot. This rate can improve as immunity increases over time.
It seemed to be just as effective in people over 70 as it was in younger people.