Report Amazing vaccine experience yesterday in Tonala at the University. in Ajijic/Chapala/Guadalajara Posted March 20 19 hours ago, rafterbr said: You are very, very lucky to get the Pfizer vaccine. I fear all the people getting the Sinaloa vaccine will one day have to redo it. ALL vaccines will need to be redone, annually. In time it will become a component of our usual annual flu shots. If you received the Sinovac shot and are concerned or frightened by what the rumour mongers are spreading around, all you have to do is get an antibody test in a few weeks to see if you have the antibodies. If you do. You are protected. It is really that simple.