Biden said that two things still concern him: "gross misinformation" from anti-vaccination activists and those who try to make vaccines a "political freedom issue."
"The word 'Covidiot' doesn't even begin to describe how inappropriate the actions of these wack jobs are," Public Safety Minister Mike Farnworth said.
The decorations have divided the internet, with one person arguing: "Halloween is for fun not for politics."
"Wow, look at all these zombies that have been indoctrinated into communism," the protester said while yelling at students during their lunch hour.
Last week, she protested her state's VaxBus program, a mobile vaccination unit to help inoculate rural residents against COVID-19.
California State Assembly member Jim Cooper said the same women harassed him outside the State Capitol building using racial undertones.
Brandy Vaughan, 45, was found dead on December 7 by her 9-year-old son in the family's California home.
Earlier this week, California brought in strict new rules in an effort to tackle the outbreak, including curfews and quarantines.
More than four in 10 Americans say they won't get the COVID vaccine when it becomes available. Big problem: Even a highly effective vaccine won't do much to rein in the pandemic if enough people can't be persuaded to get the shot.
The Moderna vaccine seems like it could save lives, but epidemiologists worry that anti-vaccination advocates may discourage people from receiving it.
The doctor who has issued the most vaccine exemptions in the San Diego area has been charged with gross negligence for granting an exemption to a four-year-old based on "irrelevant family medical history" and inadequate documentation.
The anti-vaccine lobby has only grown more powerful as measles spreads across the U.S. Unless congressional action is taken, other vaccine-preventable diseases are likely to rise.
The percentage of American children under two years of age who have received no vaccinations has quadrupled since 2001.
Anti-vaccine activities appear to be more of a western phenomenon, especially in the Pacific Northwest and American Southwest.
Researchers analyzed posts on popular anti-vaccine Facebook pages.
"It's a little different," Liff said. "My patients eat dirt. They eat poop."
Did 108 people really die from measles vaccines in the past decade? No, but don't tell anti-vaxxers that.
A rash of measles cases in Colorado, Utah and Washington State and California have been traced back to the popular theme park.