US health advisers recommend Pfizer and Moderna over J&J vaccine

A syringe is prepared with the Pfizer Covid-19 vaccine (Matt Rourke/AP)

Most Americans should be given the Pfizer or Moderna vaccines instead of the Johnson & Johnson jab that can cause rare but serious blood clots, US health advisers have recommended.

The strange clotting problem has caused nine confirmed deaths after J&J vaccinations — while the Pfizer and Moderna vaccines do not come with that risk and also appear to be more effective, advisers to the Centres for Disease Control and Prevention said.