Experts theorize why the COVID-19 variants found in the U.K. and South Africa are more transmissible than the original virus strain.

Alabama has extended its mask mandate as COVID-19 cases and hospitalizations remain high and intensive care unit capacity is stretched.

Denmark has temporarily suspended all flights from the United Arab Emirates for five days after suspicions arose that the coronavirus tests that can be obtained before leaving Dubai are not reliable

Police in London say they have broken up a wedding attended by 400 people despite a nationwide lockdown that bars households from mixing

Experts suggest upgrading to multi-layer ones, or "double-masking." could help keep you safe against the emerging U.K. strain of the virus.

President Joe Biden plans to take executive action to provide a stopgap measure of financial relief to millions of Americans

The new president signed 10 executive orders to cease the spread of the coronavirus and ramp up vaccinations, including requiring negative tests for international travelers and new mask requirements.

The world has COVID-19 more than a century after the 1918 flu pandemic.

President Joe Biden warned that the situation would get worse before getting better. Hospitals in California are overburdened and there's widespread confusion about how to get the vaccine.

President Joe Biden called for expanded COVID-19 testing, accelerated vaccine distribution and preparation for possible future pandemics. Biden called the COVID-19 response “a wartime undertaking.”

A year ago Thursday, the first U.S. patient was diagnosed with COVID-19 in Seattle.

The Centers for Disease Control and Prevention projects more than 500,000 deaths by Feb. 13 as President Joe Biden announces COVID-19 related executive orders.

Researchers are tracking another new variant in California that accounts for a third of all cases at the Cedars-Sinai Hospital in Los Angeles. They are also tracking other virus variants.

There are growing concerns about patients who have recovered from COVID-19 but are still experiencing persistent and debilitating symptoms.

President Joe Biden’s top adviser on the pandemic says the United States will again fund the World Health Organization and join its consortium aimed at sharing coronavirus vaccines fairly around the globe

President Joe Biden is putting into play his national COVID-19 strategy to ramp up vaccinations and testing, reopen schools and businesses and increase the use of masks

President Joe Biden's chief medical adviser explained how the country is coping with the new virus mutations and the latest on vaccines.

Dr. Mark Ghaly has the latest on the state’s infection rates, the vaccine rollout and more.

Drugmaker Eli Lilly says its COVID-19 antibody drug can prevent illness among residents and staff of nursing homes and other long-term care locations

Britain’s Glastonbury music festival has fallen victim to the coronavirus pandemic for the second year in a row

Dubai’s tourism department has announced an immediate halt to all live entertainment at hotels and restaurants, a day after suspending non-urgent surgeries at hospitals to deal with an influx of COVID-19 patients

How President Biden's first full day in office will impact the stock market, plus, 900,000 people filed for unemployment last week.

Dutch opposition lawmakers have slammed the government’s plan to introduce a curfew to rein in the spread of the coronavirus

The Director of the National Institute of Allergy and Infectious Diseases addresses how the new administration’s virus response will differ from Trump’s and what it means for Americans.

President Joe Biden is rolling out a national strategy to fight COVID-19, reopen the nation’s schools and restart the U.S. economy

Sharon Osbourne, Gloria Estefan, and Kristen Stewart are the latest to share they've had the coronavirus.

The pandemic has killed 400,000 Americans and crippled the U.S. economy.

The U.S. reached yet another grim milestone as the confirmed coronavirus death toll topped 400,000.

ABC News’ Kenneth Moton details the work that will go into moving the Trump family out of the White House and preparing for the arrival of the Biden family.

New strains of COVID-19 are emerging, including one from England that could become a dominant virus. Another strain could be responsible for new outbreaks in California.

Partisan and ideological differences in intended vaccine uptake remain vast.

In an exclusive interview with ABC News, Skylar Mack, 18, admits she was wrong and made a "mistake" by violating Cayman Islands' quarantine rules which eventually landed her in prison.

Public health officials are warning that the "dark winter" for the pandemic isn't over yet, as cases continue to rise and more Americans become infected with a new strain of the virus.

Just over a month after exceeding 300,000 confirmed deaths, the country is on track to hit 400,000 deaths in less than a year, according to Johns Hopkins University.

Dr. Jen Ashton has the latest on the CDC’s recommendations for home ventilation.

Exhausted nurses in rural Yuma, Arizona, are regularly sending COVID-19 patients on a long helicopter ride to hospitals in Phoenix when they don’t have enough staff

Actress Liv Tyler issued a harrowing warning over the weekend about COVID-19.

Infectious disease specialist Dr. Todd Ellerin discusses how to close the vaccine administration gap, President-elect Joe Biden's vaccine distribution plan and the staggering U.S. death toll numbers.

Skylar Mack, 18, is a free woman and back on U.S. soil after serving 32 days of her two month sentence in a Cayman Islands prison for breaking the island’s mandatory quarantine regulations.

As Tennessee has fueled one of the nation’s worst COVID-19 surges for weeks, Gov. Bill Lee’s approach hasn’t strayed much from how he and several fellow Republican governors battling similar spikes have long approached the virus

The number of elite tennis players in lockdown in Australia swelled to 72 after a fifth positive COVID-19 case emerged from the charter flights into Melbourne for the season-opening major

Los Angeles becomes the first county to reach a total of 1,000,000 coronavirus cases; officials work to solve issue of vaccination backlog.

Hundreds held a banned protest against Dutch government's coronavirus lockdown.

The Austrian government says it is extending the country’s lockdown until Feb. 7 in a drive to push down still-high infection figures as officials worry about the possible impact of new coronavirus variants

Faced with a rapid resurgence of COVID-19 overwhelming the country’s hospitals and driven by a more infectious virus variant, South Africa has delayed reopening its schools

At least 17 states have reported cases of the highly contagious variant.

The president-elect promised 100 million vaccine shots within his first 100 days in office.

Two positive coronavirus tests emerged from their charter flight from LA.

Dr. Julie Morita, the executive vice president of the Robert Wood Johnson Foundation and a member of Joe Biden's COVID-19 Task Force, discusses vaccine distribution and new concerns.

China has finished building a 1,500-room hospital for COVID-19 patients to fight a surge in infections the government said are harder to contain and that it blamed on infected people or goods from abroad