Estonian city targets kids for vaccine jabs.

A Louisiana nurse shared the emotional toll of working in the intensive care unit throughout the pandemic, saying, "We're losing people ... that are never going to see their kids graduate."

Newly published details of the Provincetown outbreak indicate that the now-dominant delta variant may be able to spread among fully vaccinated people.

Dr. Jen Ashton answers viewers’ questions about the COVID-19 vaccine.

COVID-19 vaccinations and masks will be required for all Broadway audience members when theaters reopen in the coming weeks

Proof of vaccination will be required for anyone seeing a Broadway show and all those working in the theater.

Plus, Florida Gov. Ron DeSantis says he will sign an executive order allowing parents to make decisions for their children on masking.

Publicly available mortality data shows an increasingly huge gap between Russia's official coronavirus death toll and likely real toll of the pandemic in the country.

New evidence showing the delta variant is as contagious as chickenpox has prompted U.S. health officials to consider changing advice on how the nation fights the coronavirus

The CDC's mask decision followed stunning findings from a Cape Cod beach outbreak. The viral load of vaccinated beachgoers changed what we know about the delta variant.

"In early July, we were down to 12 COVID-19 patients in the hospital, and today we have 80."

As U.S. COVID-19 cases surge, a pattern is emerging -- the same states seeing the biggest increases in COVID-19 infections also have high rates of uninsured residents.

The spread and rise of the COVID-19 delta variant has prompted some restaurants to create mask and vaccination policy changes.

A CDC document obtained by the Washington Post revealed the differences between the delta variant and previous strains is that delta is highly contagious and likely more severe.

Osaka and three prefectures near Tokyo will all go into special measures on Monday after the city reported a 180% increase in cases from the week before.

Here's why some states are fighting the CDC's recommendation that those in areas of high transmission, regardless of their vaccination status, return to wearing a mask.

Studies have found many who recovered from COVID experience cognitive decline.

Kentucky Governor Andy Beshear has defended his mask requirement for state workers, brushing off criticism by GOP officials who said they won't enforce the mandate in their offices

Hospital admissions of coronavirus patients continue to soar in Florida with at least two areas in the state surpassing previous peaks reached during last summer’s surge

Researchers are trying to unravel why some COVID-19 survivors suffer “brain fog” and other problems, with new findings suggesting some worrisome overlaps with Alzheimer's

Dozens of hospitals surveyed by ABC News across the country report that very few fully vaccinated people are ending up in the ICU with COVID-19.

Provincetown Town Manager Alex Morse reacts to the town’s COVID-19 cluster and how it’s affecting summer tourism.

Answers to viewers’ questions about COVID-19, their health and more from Dr. Jen Ashton.

Republicans and Democrats battled Wednesday over a new House mask mandate, with House Speaker Nancy Pelosi calling House GOP Leader Kevin McCarthy "a moron."

Major League Baseball had to postpone a game due to breakthrough infections. ABC News' Mona Kosar Abdi reports on what’s being announced today in Washington.

International governments and companies have pledged more than $4 billion to educate 175 million children around the world and prevent a generation’s chances being blighted by the coronavirus pandemic

Portugal is beginning its journey to what the country’s prime minister calls “total freedom.”

"Unfortunately our current leadership has turned their back on science."

A Missouri hospital that had no people hospitalized with COVID-19 just two months ago is now dealing with an onslaught of patients

Tokyo reported record numbers of new COVID-19 cases for the second day in a row.

How parents and teachers can help mitigate risk.

In Jacksonville, Florida, Baptist Health Hospital is reporting more than 400 COVID-19 patients, and Mississippi’s health officer orders hospitals to delay some elective surgeries due to rising cases.

ABC News' Patrick Reevell reports on a devastating third wave of COVID-19 in Russia as case numbers rise despite the country having what experts say is an effective vaccine.

Candy Jacobs was ruled out of the Olympic Games after testing positive for the virus upon her arrival in Tokyo.

Republicans are responding with hostility to new masking guidance from public health officials

New guidance from the federal government set off a cascade of mask rules across the nation as cities, states, schools and businesses raced to bring back mandates

Dr. Jen Ashton breaks down the latest recommendations from the CDC.

The delta variant is fueling a surge of cases in areas like Missouri, where vaccination rates are lagging.

Gov. Asa Hutchinson discusses the rise of cases of the delta variant in his state and his efforts to vaccinate residents.

The agency is advising fully-vaccinated people to return to wearing masks indoors in areas of substantial or high levels of COVID-19 transmission. ABC News' Mona Kosar Abdi reports.

Plus, Simone Biles’ Olympic future uncertain after pulling out of another event and Indonesia faces oxygen shortages amid rising COVID-19 hospitalizations.

The CDC reports breakthrough cases have occurred in less than 1% of fully vaccinated people.

Top health officials in the United States are recommending that vaccinated people return to wearing masks indoors in places where the coronavirus is surging

Health officials say infected youth are a driving factor in Mexico's third wave of COVID-19 cases

Dr. Paul Offit, director of the Vaccine Education Center, weighs in on the mask reversal guidelines.

The CDC changed its mask guidance due to rising COVID-19 cases, advising that fully-vaccinated people return to wearing masks indoors in areas of high transmission.

The Centers for Disease Control and Prevention changed its mask guidance due to rising COVID-19 cases, advising that fully-vaccinated people return to wearing masks indoors in areas of high transmission.

In changing the recommendations for masking, the CDC cited increasing concern around the fast-spreading delta variant.

The Centers for Disease Control and Prevention cited increasing concern around the highly-contagious delta variant and recommended that everyone in areas with high levels of COVID wear a mask.

ABC News' Britt Clennett reports on the COVID-19 crisis in Indonesia where the delta variant is spreading rapidly. India and others countries in Asia are struggling with low vaccination rates.