With more than 30% of the American population still unvaccinated against Covid-19, US President Joe Biden is doubling down on his appeal for people to turn up for their shots. 

Cautioning Americans against getting “too comfortable” in the fight against the virus, he noted that nearly half of new infections in some States is owing to the Delta variant, which researchers have confirmed is significantly more contagious than other strains and potentially more deadly.

As of Monday, there were 67% of adults in the US receiving at least a single Covid-19 dose. The figure is just shy of Biden’s target of reaching 70% by Independence Day on July 4th.

“Our fight against this virus is not over,” Biden said on Tuesday as he delivered remarks from the White House.

“Right now, as I speak to you, millions of Americans are still unvaccinated and unprotected. And because of that, their communities are at risk. Their friends are at risk, the people that they care about are at risk. This is an even bigger concern because of the delta variant.”

To raise vaccination numbers, the White House pandemic response team is planning to direct more vaccines to doctors’ offices and pediatricians so that individuals, specifically those ages 12-18, can have access to the shots.

The US President also highlighted door-to-door, community level outreach and mobile vaccination clinics as ways to bring the vaccine to more Americans this summer.