In the run up to Americas Independence Day weekend, US President Joe Biden on Friday declared that the US is heading into a “very different summer compared to last year” after 300 million Covid-19 vaccines in arms in the 150 days since he took office.

“We’re heading into a very different summer compared to last year,” Biden said. “A bright summer. Prayerfully, a summer of joy.”

The White House announced plans to host more than a 1,000 guests – mainly frontline workers and their families – on the South Lawn for a cookout on July Fourth.

This is tipped to be one of the biggest in-person events of Biden’s presidency so far.

Biden was aiming to have 70 per cent of Americans at least partially vaccinated against Covid-19 by 4 July.

With the pace of vaccinations now dropping sharply in April, the current number stands at 65 per cent. Among adults alone, 55 per cent are fully vaccinated. Across America, 26 states and Washington DC have fully vaccinated 50 per cent or more of adults, according to White House data.

Based on the Centers for Disease Control and Prevention (CDC) data, 42.6 per cent of the US population is now fully vaccinated. Covid-19 caseloads, hospitalisations and deaths in the US are down to their lowest levels since the start of the pandemic last year.

Despite the upside of strong vaccination numbers, the CDC is warning that the Delta variant of the coronavirus, first detected in India, is surging and will become the dominant strain in the US.

The CDC is telling Americans that those who get their shots will be “protected against this Delta variant.”

Three characteristics of the latest variant have doctors hitting the alarm bells again.

It’s more contagious, more deadly and causing more breakout infections even among those who are partially vaccinated, according to Dr. Ashish Jha, dean of the Brown University School of Public Health.

“If you’re fully vaccinated, you’re actually pretty well protected. But even if you’re just partly vaccinated, we’re seeing a lot of breakthrough infections. So, this is possibly the worst variant we have seen, the most challenging variant throughout the entire pandemic,” Jha told NBC.

As part of the administration’s vaccination push, Vice President Kamala Harris traveled to Atlanta on Friday to tour a pop-up Covid-19 vaccination site at Ebenezer Baptist Church, where Dr. Martin Luther King Jr. was a pastor until his assassination in 1968. The current senior pastor is U.S. Sen. Raphael Warnock.

Harris also spoke at a Covid-19 vaccination mobilization event at Clark Atlanta University, a historically Black school.

She told students they “have the power to end this pandemic” by giving people information about the multitude of resources, such as free car rides and child care, that are available to help them get vaccinated.