the cellular immune response is triggered by t cells that have been activated by a suitable antigen. on the one hand, cytotoxic t cells destroy infected body or cancer cells and on the other hand, t helper cells trigger further immune responses - 快速診斷測試 幅插畫檔、美工圖案、卡通及圖標
a set of covid-19 rapid rapid antigen test result strips showing positive, negative and invalid results - 快速診斷測試 幅插畫檔、美工圖案、卡通及圖標
