More than 33 million people in the state will be affected by the lockdown.
A pandemic of the novel coronavirus has now infected more than 66.4 million people and killed over 1.5 million worldwide, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.
A new stay-at-home advisory in Delaware will ban residents from gathering indoors with anyone not in their household, reported ABC Philadelphia station WPVI.
The order will last from Dec. 14 to Jan. 11.
Gov. John Carney also announced a new mask mandate requiring masks whenever indoors with someone from outside the household.
The first vaccine doses have arrived in the United Kingdom after being transported on freezer trucks from the production facility in Belgium, British authorities confirmed to ABC News. The doses are on their way to distribution centers, which will then dole them out to be administered according to the priority list.
The U.K. Department of Health and Social Care announced Wednesday that a vaccine developed by Pfizer and BioNTech has been approved for use in the U.K.
Vaccinations for some high-priority people could begin next week. The majority of U.K. vaccinations will take place next year.
-ABC News' Angus Hines
California Gov. Gavin Newsom said he's "pulling the emergency break" and asking residents to not gather with people outside of their household.
In regions where the ICU capacity is below 15%, a stay-at-home order will go into effect for three weeks, Newsom said.
ABC Los Angeles station KABC reports that latest projections show all of the state's regions except the Bay Area falling below 15% in the next few days.
In those regions, bars, hair salons and personal care services will close, he said.
"If we don't act now our hospital system will be overwhelmed... we'll continue to see a death rate climb," Newsom said.
Facebook said it will remove false claims about COVID-19 vaccines on Facebook and Instagram.
"This could include false claims about the safety, efficacy, ingredients or side effects of the vaccines. For example, we will remove false claims that COVID-19 vaccines contain microchips, or anything else that isn’t on the official vaccine ingredient list," Facebook said in a statement. "We will also remove conspiracy theories about COVID-19 vaccines that we know today are false."
