San Francisco has become the first major city in the US to require proof of full vaccination against the coronavirus for people to dine inside restaurants, work out in gyms or attend indoor concerts, reports AP.

Restaurants and bars have posted signs and added extra staff to begin verifying proof of vaccination before allowing people in.

The new rule goes beyond New York City, which only requires people to be at least partially inoculated for a variety of indoor activities.

Local business groups in San Francisco have supported the new vaccine mandate, saying it will protect their employees and customers' health and keep them from having to limit capacity indoors.