Coronavirus updates: Herd immunity by fall 'ambitious,' says surgeon general nominee

In 44 states, the seven-day average of new cases dropped over 10%.

A pandemic of the novel coronavirus has now infected more than 98.7 million people worldwide and killed over 2.1 million of them, according to real-time data compiled by the Center for Systems Science and Engineering at Johns Hopkins University.


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California reports highest daily death toll

California reported its highest daily death toll since the start of the pandemic with another 764 lives lost.

The state reported 23,024 new cases on Friday.


Severe allergic reactions rare but possible with Moderna vaccine

A CDC report released Friday indicates that the risk of severe allergic reactions with Moderna's vaccine is low. Severe, life threatening allergic reactions were seen in 2.5 cases per million people receiving the first dose of the Moderna COVID-19 vaccine, the report said.

Of the 4,041,396 first doses given as of Jan. 10, there were 1,266 (0.03%) reports of "adverse events," the report said. Among those, 108 "adverse events" were considered as possible cases of severe allergic reaction, including anaphylaxis. Ten cases were determined to be anaphylaxis (a rate of 2.5 anaphylaxis cases per 1 million doses) including nine people with a documented history of allergies or allergic reactions, the report said.

ABC News’ Sony Salzman contributed to this report.


UK variant may be associated with higher mortality, Boris Johnson says

More people are testing positive for the United Kingdom’s variant of the coronavirus, and British Prime Minister Boris Johnson said Friday “there is some evidence that the new variant may be associated with a higher degree of mortality.”

U.K. Chief Medical Officer Chris Whitty stressed that the data is uncertain and there is a chance the new variant is increasing infections and mortality.

The U.K. has seen record daily death tolls several times this week.

There were 1,401 deaths in the last 24 hours.

ABC News’ Kirit Radia, Sony Salzman and Joe Simonetti contributed to this report.


New York running out of vaccines today but more on the way: Cuomo

New York state has used 97% of its allocated vaccine doses so far (for weeks 1 through 5) and will run out of doses by the end of the day, Gov. Andrew Cuomo said Friday.

Week 6 doses are currently being delivered, the governor said.

New York’s positivity rate has fallen to 5.65%, Cuomo said. Hospitalizations are also on the decline.

ABC News’ Rachel Katz contributed to this report.


LA Fire Department sees positivity rate plummet after most firefighters get vaccinated

The Los Angeles County Fire Department (LACoFD) saw its COVID-19 testing positivity rate fall significantly after 75% of firefighters on the force received their first COVID-19 vaccine.

When the first vaccines were being rolled out in late December, weekly LACoFD positivity rates reached 18%, roughly equivalent to positivity rates in the county's general population. Today, after three-quarters of the force opted to get vaccinated, the LACoFD positivity rate has fallen to 5.6%.

"As expected, the vaccine began to have its impact seven to 10 days after the first vaccines were given," Dr. Clayton Kazan, the department's medical director, said in a statement. "This is the first time in the entire pandemic that our data diverged from that of the county," he added.

This week, firefighters will start receiving their second dose of the two-dose vaccine.

-ABC News' Matthew Fuhrman contributed to this report.