The Centers for Disease Control and Prevention is recommending that people who experience certain new symptoms after receiving Johnson & Johnson's Covid-19 vaccine seek immediate medical treatment.
These include sudden, severe headache, backache, new neurological symptoms, severe abdominal pain, shortness of breath, leg swelling, tiny red spots on the skin, and new or easy bruising.
The CDC, along with the US Food and Drug Administration, recommended a pause last week in the use of the Johnson & Johnson vaccine due to a small number of reports of a rare severe type of blood clot occurring in those who had received the vaccine. Similar issues have not been reported following the administration of the Pfizer or Moderna vaccines.
While Johnson & Johnson's vaccine is still authorized, the pause gives scientists time to review data and determine whether the vaccine is actually linked to the blood clots and, if so, whether recommendations on who should receive it should change.
For those who have received the Johnson & Johnson vaccine within the last three weeks, the risk of developing the rare blood clot would be very low to start with and would decrease over time, the CDC said.
The agency also recommends that any adverse reactions be reported through the Vaccine Adverse Event Reporting System.