Is there really a preferred vaccine? NACI under fire after new guidance conflicts with earlier advice

The National Advisory Committee on Immunization (NACI) is being criticized for muddling messages about vaccines. It now suggests some Canadians wait for mRNA shots from Pfizer or Moderna if possible, rather than viral vector doses from AstraZeneca and Johnson & Johnson. But as David Akin reports, federal officials are still encouraging Canadians to get the first shot offered to them.

• EU hasn’t ordered more AstraZeneca COVID-19 vaccines past June, official says
• U.K. will offer alternative to AstraZeneca shot to people under 40
• Confusion, anger arises over NACI’s mixed messaging on ‘preferred’ COVID-19 vaccine