Global News at 5:30 Toronto July 12 2021 6:10pm 02:03 Do Canadians need a 3rd Pfizer shot? Pfizer has been pitching booster COVID-19 shots. It’s something some countries are offering to people with compromised immune systems, but could we see the same thing here in Canada? Our Morganne Campbell has more in this report. Pfizer claims third vaccine dose increases protection against COVID-19 Delta variant Longer gap between Pfizer COVID-19 vaccine shots boosts antibodies higher, study finds REPORT AN ERROR Responsive site?