1. There are 3 vaccines distributed in San Joaquin County As in California and the rest of the country. The United States has approved the distribution of the Pfizer, Moderna and Johnson & Johnson vaccines. All three are authorized by the Food and Drug Administration. The Pfizer-BioNTech vaccine was authorized on Dec. 11. A few days later, Moderna was on Dec. 18. These two vaccines are received in two doses (or shots). The Johnson & Johnson one-dose vaccine was authorized on Feb. 27. This vaccine does not need a second shot like Pfizer and Moderna do. 2. Vaccines have been tested and are safe When vaccines reach the public, they must have been tested and approved first by the agencies in authority (the FDA in this case).