The CDC and the FDA said Tuesday they are recommending a "pause" in the use of the single-dose Johnson & Johnson COVID-19 vaccine out of an "abundance of caution" while a review of reports of rare, potentially dangerous blood clots is conducted. In a joint statement on Tuesday, the two agencies said they are "reviewing data involving six reported U.S. cases of a rare and severe type of blood clot in individuals after receiving the J&J vaccine." "In these cases, a type of blood clot called cerebral venous sinus thrombosis (CVST) was seen in combination with low levels of blood platelets (thrombocytopenia)," … "All six cases occurred among women between the ages of 18 and 48, and symptoms occurred 6 to 13 days after vaccination."