FDA 顾问建议开发一种新型 COVID 疫苗来应对保护力减弱和新出现的变种。 FDA advisers recommend a new COVID vaccine to address waning protection and emerging variants.

由于去年疫苗的保护作用逐渐减弱，FDA 顾问建议接种一种针对新病毒版本的新型 COVID 疫苗。 The FDA advisers recommend a new COVID vaccine, targeting a new virus version, due to the waning protection of last year's shots. 旧疫苗接种后4周内感染预防有效率达到峰值52.2%，住院预防有效率达到66.8%，10周后分别降至34.6%和44.4%。 The effectiveness of the old vaccine peaked at 52.2% for infection prevention and 66.8% for hospitalization prevention after four weeks, dropping to 34.6% and 44.4% after ten weeks. 新疫苗旨在增强免疫力并预防新出现的 SARS-CoV-2 变种。 The new vaccine aims to boost immunity and protect against emerging SARS-CoV-2 variants.