These US states have fully vaccinated at least 50% of adults.

In New Jersey, mask-wearing and social distancing requirements will be lifted Friday regardless of vaccination status, except for certain designated situations, Gov. Phil Murphy said Monday. Individual businesses can require employees and customers to wear masks if they choose, he said.

In Michigan, Gov. Gretchen Whitmer announced updated return-to-work protocols and guidance including allowing fully vaccinated employees to forgo wearing face masks and social distancing. Whitmer said the state has reached the 55% vaccination threshold.

Air travel hit a new high of the pandemic last weekend, with the Transportation Security Administration saying it screened 90% of the total number of people it screened on the equivalent day in 2019, long before the pandemic.

The Sunday figure of 1.86 million people screened is compared to nearly 2.1 million on the equivalent Sunday of 2019. At this point in 2020, the pandemic had driven air travel into a deep hole, and the TSA reported only 267,000 screenings.

The new number beat the previous record set one week earlier.

With Memorial Day just one week away, planes are nearly as full as before the pandemic. The average domestic flight is carrying 98 passengers, compared to an average of 99 passengers in 2019, according to data from Airlines for America.

Nearly half of all in the US have gotten one shot

More than 49% of the country’s total population has gotten at least one shot while more than 39% of the population is fully vaccinated, the data shows.

The state with the highest proportion of adults who have been fully vaccinated against Covid-19 is Maine — with more than 62% of people 18 and over having completed their shots.

“Across the country, cases of Covid-19, serious illness and loss of life are all down dramatically,” White House senior Covid-19 adviser Andy Slavitt said during a briefing on Friday. “And they can be brought down even further and the risk of a future wave in your community significantly reduced if we keep up the pace of vaccinations.”

Pharmacy technicians fill syringes with Pfizer’s Covid-19 vaccine on March 2 at the Portland Expo in Portland, Maine

Here’s how many Covid-19 cases US is averaging

In the past week, the US has averaged more than 25,000 new cases and more than 540 new Covid-19 deaths daily, according to data from Johns Hopkins University.

Those are still high numbers, experts say.

But they’re way down from where the nation was just weeks ago. The country’s average of daily Covid-19 cases in the past week is down by 57% from what it was a month ago, according to Johns Hopkins data.

And the seven-day average of daily Covid-19 deaths is down by 23% from a month ago, according to that data.

“The people who are getting infected now tend to be people who are younger, less vulnerable to the infection, because a lot of the vulnerable population has been vaccinated,” Dr. Scott Gottlieb, former Food and Drug Administration commissioner, said Sunday on CBS’ “Face the Nation.”

“The people most likely to get into trouble with Covid have now been protected through vaccination and you’re seeing a rapidly declining rate of new hospitalizations as a consequence of that fact,” Gottlieb added.

Children don’t need masks outdoors, expert says

“Wearing a mask, you know, is difficult in the summertime when it’s hot, and I don’t think that the risk merits that,” Gottlieb said. “But I do think parents need to make an assessment about the risk of the environment that the child is going to be in.”

For example, in crowded indoor settings, having kids wear masks is reasonable, he said.

The CDC has said it’s working on updating its summer camp guidance.

Since there is no vaccine for children under 12, the American Academy of Pediatrics (AAP) said last week that children and adults who are not yet fully vaccinated against Covid-19 still need to wear masks in certain settings.

Children should continue wearing masks in public places as they have throughout the pandemic, particularly when social distancing isn’t possible, said Dr. Yvonne Maldonado, chair of the AAP’s Committee on Infectious Diseases.

Children can take off their masks when they are with family members from the same household or at small gatherings with fully vaccinated family members and friends and during water sports, such as swimming, or activities in which masks could pose a safety risk, such as gymnastics.

Children under 2 years old also do not need to wear masks, Maldonado said.