Nigeria, April 13 -- The U.S. Centers for Disease Control and Prevention and the US Food and Drug Administration have recommended that the United States pause the use of Johnson & Johnson's Covid-19 vaccine over six reported U.S. cases of a "rare and severe" type of blood clot.

This six cases occurred among women aged 18 and 48, and symptoms occurred six to 13 days after vaccination, according to a joint statement on Tuesday from Anne Schuchat, principal deputy director of the CDC and Peter Marks, director of the FDA's Center for Biologics Evaluation and Research.

The six reported cases were among more than 6.8 million doses of the Johnson & Johnson vaccine administered in the United States.

In a statement, the CDC said, it will conven...