COVID-19 vaccine proves cost-effective, especially for older adults, significantly reducing illness and hospitalizations across all age groups.

The Food and Drug Administration could pull Pfizer's coronavirus vaccine emergency authorization for children under age 5.

The uncertainty surrounds who will be able to get updated vaccines in coming months – shots created to protect against more recent strains of COVID-19.

Pfizer said Health Canada has approved its latest COVID-19 vaccine that targets a new Omicron variant. It will be made available in the fall.

XFG causes a severe sore throat and hoarseness, hence the “razor blade COVID” nickname. Symptoms common to other variants include fever or chills, cough, shortness of breath or difficulty breathing, sore throat, congestion and runny nose, loss of taste or smell, fatigue, muscle and body aches, headache, nausea and vomiting, and diarrhea.