A Canadian advisory committee says Canadians who got the AstraZeneca shot for their first vaccine dose should not get the second one.

It says they should get the Pfizer or Moderna vaccine for their second shot instead.

The vice-chair of the board says new evidence suggests responses are better when the AstraZeneca vaccine is followed by an mRNA vaccine and said the new guidance also takes into account the marginal risk of blood clots associated with AstraZeneca.

However, she said anyone who got two shots of AstraZeneca can feel confident they are protected.

This story originally reported by Simon Kaufman and Jay Strubberg on Newsy.com