International
The Pfizer, Moderna and AstraZeneca vaccines are highly effective against severe COVID-19 requiring an emergency department (ED) or urgent care clinic visit, hospitalisation, or ICU admission, according to US research. The study looked at more than 60,000 ED visits or hospital admissions and estimated vaccine effectiveness by comparing the odds of a positive test for SARS-CoV-2 infection among vaccinated patients with those among unvaccinated patients. They found the mRNA vaccines (Pfizer and Moderna) were 91 effective against COVID-19 infection leading to an emergency department visit, while the AstraZeneca vaccine was 73 effective. The effectiveness was similar in at-risk populations such as those over 85 years of age and those with chronic medical conditions.
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