Association of COVID-19 Vaccination and Clinical Severity of

Association of COVID-19 Vaccination and Clinical Severity of Patients Infected with Delta or Omicron Variants — China, May 21, 2021–February 28, 2022

Association of COVID-19 Vaccination and Clinical Severity of Patients Infected with Delta or Omicron Variants — China, May 21, 2021–February 28, 2022
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China , South Africa , , National Immunization Program Information System , World Health Organization , National Notifiable Disease Reporting System , Ibm , University Of Hong Kong , Eighth Version , Hong Kong , Covid 19 , Vaccinations , Linical Severity ,