Hybrid immunity is 'best protection' against COVID-19, study finds

This colorized electron microscope image made available by the National Institute of Allergy and Infectious Diseases in November 2022, shows cells, indicated in purple, infected with the omicron strain of the SARS-CoV-2 virus, orange, isolated from a patient sample, captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Md. (NIAID/NIH via AP) This colorized electron microscope image made available by the National Institute of Allergy and Infectious Diseases in November 2022, shows cells, indicated in purple, infected with the omicron strain of the SARS-CoV-2 virus, orange, isolated from a patient sample, captured at the NIAID Integrated Research Facility (IRF) in Fort Detrick, Md. (NIAID/NIH via AP)

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