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Those numbers are probably pretty close. It is not known if the 2nd shot gives a significantly longer response. Get the specified 2nd shot until more is known and recommendations are made.
The J&J trial was still going on when the variants were starting to spread. The Moderna and Pfizer trials were complete before the variants took hold. Understandable why the one shot J&J would show lower effectiveness compared to the one/two shot Pfizer/Moderna.
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