Those tests r made in labs and limited persons...Every thing differs from place to place, weather, human body nature, to many extent...Their studies and reports r Not matching with ground reality...same situation here.
All my friends, collegues and family members were safe and completely free from covid without any symptoms in 1st wave.
but this year even after completing their both doses in Mayb almost have of them have tested positive and 6-7 have been died and most of the positive had post covid complications. So i feel vaccine is not works in most of the people and effectiveness will be below 30%.