Just after the region began dispensing Johnson & Johnsonâs Janssen COVID-19 (J&J) vaccine at clinics, the CDC and the FDA recommended a pause in the use of the vaccine due to a small number of reports of blood clots. On April 13, the departments called for a pause on the vaccineâs use after a small number of ârare and severeâ blood clots were reported in people, all women between the ages of 18 and 48, after receiving the J&J vaccine. These symptoms occurred six to 13 days after vaccination. As of April 13, nearly seven million doses had been administered nation-wide. As of April 13, the CDC reported that of the 189 million doses administered of the Pfizer and Moderna vaccines, âno reports matching those associated with the [J&J] vaccine have been received.â