18 US states have still not vaccinated at least half of their residents

With a surge in new Covid-19 cases and hospitalizations, health officials and state leaders have ratcheted up their calls for the public to be vaccinated before winter arrives while the US Centers for Disease Control and Prevention has approved booster shots for an expanded number of Americans.With a surge in new Covid-19 cases and hospitalizations, health officials and state leaders have ratcheted up their calls for the public to be vaccinated before winter arrives while the US Centers for Disease Control and Prevention has approved booster shots for an expanded number of Americans.