Differences in vaccines

Presently there are three vaccines for COVID 19 corona virus that have been approved in the USA for use.

1. Pfizer vaccine; 2. Moderna vaccine; 3. Johnson & Johnson vaccine.

The Pfizer and Moderna vaccines used no aborted baby cells in the testing or production of their vaccine and require two shots. Johnson & Johnson used aborted baby cells in both the testing and production of their vaccine and...