Our research shows that a significant amount of antibodies remains in those who received the first dose. Dr. Jeewandara said that the university had started measuring efficacy and antibodies from vaccines since Sri Lanka started administering them. In Sri Lanka most people who contract COVID19 don’t develop symptoms. What we did was to test antibodies but this hints at vaccine efficacy too. However, Sri Lanka used several vaccines, giving the country an excellent opportunity to find out what vaccine was best.

Source: The Nation July 23, 2021 00:22 UTC