主题：【原创】我的chatGPT的使用体验 -- Swell

我帮你问了一遍，把答案贴在这：

can pfizer vaccine prevent covid 19

Yes, the Pfizer-BioNTech COVID-19 vaccine has been shown to be effective in preventing COVID-19. According to clinical trials, the vaccine has been shown to have an efficacy rate of over 95% in preventing symptomatic COVID-19 infections, as well as reducing the severity of illness in individuals who still contract the virus. It is important to note that like all vaccines, no vaccine is 100% effective and there is still a small chance of getting infected with the virus even after getting vaccinated. However, getting vaccinated with the Pfizer-BioNTech vaccine can greatly reduce the risk of getting sick and spreading the virus to others.