The U.S. Centers for Disease Control and Prevention announced Monday afternoon it will shorten the recommended isolation time for some people infected with COVID-19.

Patients who are asymptomatic will have to isolate for five days, followed by five days of wearing a mask around others, under the new guidance. Previously, the isolation period was 10 days for everyone.

Individuals who have received their booster shot do not need to quarantine following an exposure, but should wear a mask for 10 days after the exposure, the CDC said.

"The Omicron variant is spreading quickly and has the potential to impact all facets of our society. CDC’s updated recommendations for isolation and quarantine balance what we know about the spread of the virus and the protection provided by vaccination and booster doses," CDC Director Dr. Rochelle Walensky said in a statement.

The Texas Department of State Health Services announced Monday that centers in Austin, El Paso, Fort Worth, San Antonio and The Woodlands ran out of sotrovimab, the monoclonal antibody effective against the COVID-19 omicron variant.

The federal government won't be able to ship more supplies of the treatment until January, the department said.

Those centers will still be able to provide monoclonal treatment for any patient who hasn't contracted the omicron variant, according to the department.

French Prime Minister Jean Castex and Health Minister Olivier Véran announced a host of new measures Monday to combat the rising COVID-19 cases.

The country has recorded 30,383 cases in the last 24 hours, according to officials.

Starting Jan. 3, all companies will be required to have their employees work from home at least three days a week, when possible.

France will also limit large indoor gatherings 2,000 people and outdoor gatherings to 5,000.

Officials also announced a ban on eating and drinking in movie theaters and on public transportation. The new measures will be in effect for at least three weeks, officials said.

-ABC News' Ibtissem Guenfoud

Pediatric hospitalizations for COVID-19 in the U.S. are surging to their highest levels since early September.

Across the country, almost 2,000 children are hospitalized with confirmed or suspected cases of the virus, according to federal data.

This is a roughly 60% from one month ago.

On average, about 260 children are being admitted to the hospital each day.

On a state level, more children are hospitalized with COVID-19 in New York than in any other state in the U.S.

-ABC News' Arielle Mitropoulos

The United Kingdom, Italy and Greece broke records on Wednesday for daily new COVID-19 cases, according to government health officials.

The Greek government reported a record increase for new cases for a third consecutive day with 28,828 new cases and 72 COVID-19-related deaths.

About 64.3% of the population is fully vaccinated and 26.5% have received a booster or third dose, according to the European Centre for Disease Prevention and Control.

Health Minister Thanos Plevris announced on Wednesday that new restrictions will go into effect on Jan. 3, but Greece's Kathimerini newspaper reported that the government has decided to put them into effect at 6 p.m. local time on Thursday.

Italian health authorities recorded another record increase on Wednesday with 98,0303 new COVID-19 cases and 148 deaths.

Semi-official ANSA reported Wednesday's positivity rate is 9.5% and there are 1,185 patients in ICUs. About 51.7% of Italy's residents are fully vaccinated and 24.9% have received a booster or 3rd dose, per the ECDC.

UK health officials recorded 183,037 new cases and 57 deaths. The record-setting new case number included five days of data from Northern Ireland, which last published data on Dec. 24, according to health officials.

About 82.3% of adults in the UK have received two vaccine doses and 57.5% have received a booster, according to government data.

-ABC News' Christine Theodorou