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jM¦tile:Fact checks on the novel coronavirus content:Examples Please choose the correct statement regarding the COVID-19 vaccine.1. After vaccination, infection is not prevented completely and may contribute to the spread of infection, but side effects are few.2. It can prevent infection completely after vaccination and is particularly effective in the elderly, but there have been reports of temporary side effects after vaccination.3. Vaccination is effective against advanced viral mutations, with a single dose providing long-lasting immunity.4. Vaccination varies in effectiveness based on specific genotypes and requires genetic testing, but booster shots are not required.