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The effectiveness of the Pfizer and AstraZeneca COVID-19 vaccines turns negative against severe COVID-19 months after administration, according to a new study.
A single dose of the Pfizer vaccine was pegged at minus 121 percent effectiveness on day 84 and minus 85 percent effectiveness on day 98. A second Pfizer dose held up better, but still dipped below 50 percent at day 98, researchers concluded.
A single dose of the AstraZeneca vaccine turned negative at day 70 and a second dose turned negative at day 84, according to the paper, which was published in the International Journal of Epidemiology.
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