The risk of contracting COVID-19 was 1.5 times higher for those who received two doses, 1.95 times higher for those who received three doses, and 2.5 times higher for those who received more than three doses, the researchers found. The higher risk was compared to people who received zero or one dose of a vaccine.
The work of Dr. Naabin Shrestha and others was used in the report and found, “The risk of contracting COVID-19 was 1.5 times higher for those who received two doses, 1.95 times higher for those who received three doses, and 2.5 times higher for those who received three or more doses.”
Even after adjusting for variables, the elevated risk remained.
“The exact reason for this finding is not clear. It is possible that this may be related to the fact that vaccine-induced immunity is weaker and less durable than natural immunity. So, although somewhat protective in the short term, vaccination may increase risk of future infection,” the researchers said in the paper, which was released as a preprint.
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