Americans are being more careful to avoid catching and spreading the coronavirus but are still not being careful enough to slow the pandemic, especially with worrisome, apparently more contagious new variants looming.

That's the conclusion of the latest findings, released Friday, from the largest national survey tracking behavior during the coronavirus pandemic.

"It's good news-bad news," says David Lazer of Northeastern University, who is helping run the survey with colleagues at Harvard, Rutgers and Northwestern universities.

"The good news is we've improved a lot in terms of mask-wearing and social distancing. The bad news is, to bend the curve they really need to be much better," Lazer says.

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Since the pandemic’s descent, they have generally been viewed as among those at higher risk — older Americans, some of them medically vulnerable, figuring out how to navigate life in a COVID-saturated, increasingly isolated world.

The Latest: Germany reaches more than 1 million vaccinations BERLIN -- Germany has carried out more than a million vaccinations as new infections and deaths remain high and officials mull whether to increase lockdown measures. Figures released by the... AP NEWS

LOS ANGELES — California officials are touting a new mass vaccination site at Dodger Stadium while acknowledging it’s unclear how much more supply is coming from the federal government.

Global COVID-19 death toll tops 2 million The worldwide coronavirus death toll surpassed 2 million on Friday, according to a Reuters tally, as nations around the world are trying to procure multiple vaccines and detect new COVID-19 variants. Shaina Ahluwalia, Kavya B U.S.

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Norway adjusts advice after vaccine deaths but isn't alarmed COPENHAGEN, Denmark (AP) — Norwegian officials have adjusted their advice on who gets the COVID-19 vaccine in light of a small number of deaths in older people, leaving it up to each doctor to... AP NEWS

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How effective is a single vaccine dose against Covid-19? Pretend it didn't happen – expert advice on how to behave after receiving a single dose of any of the Covid-19 vaccines. Zaria Gorvett BBC_Future

 ... Most vaccines require booster doses to work.