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I also find it weird that although two doses cannot kill the virus let's try three !
Why is that weird? The virus has mutated and the vaccines are not as effective against the current dominant strain, Delta.
Scientists are doing their best. Earlier last year there were many articles claiming there would never be a vaccine for COVID-19. They claimed such a vaccine was scientifically impossible. But they came out with several successful vaccines that have saved millions of lives. The fact that dosages may need fine tuning is neither here nor there.