Short Answer: If optimizing for efficacy, the booster shot will likely be worth it for Pfizer, whereas other vaccines don’t have clear evidence of declining efficacy yet. If optimizing for safety, one should be skeptical of the booster since a 3-dose regiment hasn’t been tested in clinical trials.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice.