Messenger RNA Covid vaccines 66% effective against Delta: US study

www.news.com.au
2 min read
fairly difficult
<p>The effectiveness against infection of the Pfizer and Moderna Covid-19 vaccines dropped from 91 percent before the Delta variant became dominant to 66 percent afterwards, according to a large study of US health workers published Tuesday.</p>
The Centers for Disease Control and Prevention (CDC) has been examining the real-world performance of the two vaccines since they were first authorized among health care personnel, first responders and other frontline workers

The effectiveness against infection of the Pfizer and Moderna Covid-19…
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