Health expert answers your questions about the Johnson & Johnson vaccine Why have the blood clots only been seen in women? One health expert provides answers to your questions about the Johnson & Johnson vaccine. Author: Clay Gordon Updated: 6:08 PM EDT April 13, 2021 COLUMBUS, Ohio — Many questions remain Tuesday after the CDC and FDA recommended a pause in administering the Johnson & Johnson vaccine. The agencies announced an investigation into reports six women had potentially formed rare blood clots following their shot. The FDA and CDC say it may take several days before the details of the investigation into its recommendations are released. Dr. Joseph Gastaldo is an Infectious Disease doctor at OhioHealth. He recommends anyone experiencing severe headache, abdominal pain, leg pain, or shortness of breath within three weeks after getting the Johnson & Johnson vaccine seek medical attention.