Joe Neel

Updated 9:31 p.m. ET Thursday

The U.S. now has more coronavirus cases than any other country in the world, surpassing China's total and highlighting how rapidly the virus can move through a population.

The U.S. logged more than 83,000 cases as of 8 p.m. ET Thursday, while China reported more than 81,00 infections, according to data compiled by Johns Hopkins University.

One of the members of the White House Coronavirus Task Force said she had a "little low-grade fever" over the weekend and stayed home from work that day.

Dr. Deborah Birx, the task force response coordinator, said she went to Walter Reed National Military Medical Center late Saturday night and got tested. The test came back was negative.

"So actually [it was] probably a [gastrointestinal] thing," she said at a task force briefing with President Trump looking on. "But, you know, I'm meticulous. I'm a physician. I looked it up."

Income inequality in the U.S. is at an all-time high, according to the Census Bureau. And a recent poll from NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health shows that regardless of their income, Americans generally view this as a serious problem.

Updated at 8:15 p.m. ET

The Centers for Disease Control and Prevention said Friday that the number of possible cases of severe respiratory illnesses among people who vaped nicotine or cannabis-related products has more than doubled, to 450 in 33 states.

Trump administration health officials are spelling out their ambitious plan to stop the spread of HIV in the U.S. within the next 10 years.

The plan would target 48 counties where the rate of HIV spread is the highest, along with Washington, D.C., and San Juan, Puerto Rico. Seven states with high rates of HIV in rural areas would also be targeted, including Oklahoma, Missouri, Kentucky, Arkansas, Alabama, South Carolina and Mississippi.

Editor's note: This story was updated at 2:45 p.m. to include more information.

James P. Allison and Tasuku Honjo will be awarded the 2018 Nobel Prize in Physiology or Medicine for discoveries which led to the development of a revolution in cancer treatment — therapies that work by harnessing the body's own immune system.

Dr. Brenda Fitzgerald, director of the Centers for Disease Control and Prevention, resigned Wednesday following reports that she bought shares in a tobacco company, among other financial dealings that presented a conflict of interest.

Discrimination in the form of sexual harassment has been in the headlines for weeks now, but new poll results being released by NPR show that other forms of discrimination against women are also pervasive in American society. The poll is a collaboration with the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

For example, a majority (56 percent) of women believe that where they live, women are paid less than men for equal work. And roughly a third (31 percent) say they've been discriminated against when applying for jobs because they are women.

New results from an NPR survey show that large numbers of Asian-Americans experience and perceive discrimination in many areas of their daily lives. This happens despite their having average incomes that outpace other racial, ethnic and identity groups.

More than half of lesbian, gay, bisexual, transgender and queer Americans say they have experienced violence, threats or harassment because of their sexuality or gender identity, according to new poll results being released Tuesday by NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

More than half of Native Americans living on tribal lands or other majority-Native areas say they have experienced racial or ethnic discrimination when interacting with police (55 percent) and applying for jobs (54 percent). That's according to new poll results being released Tuesday by NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

A new poll out this week from NPR finds that 60 percent of black Americans say they or a family member have been stopped or treated unfairly by police because they are black. In addition, 45 percent say they or a family member have been treated unfairly by the courts because they are black. The poll is a collaboration between NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

Majorities in many ethnic, identity and racial groups in America believe that discrimination exists against their own group, across many areas of people's daily lives, according to a poll from NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

The poll asked a wide range of questions about where Americans experience discrimination — from the workplace to the doctor's office — and people's perception of it. The groups polled include whites, blacks, Latinos, Asian-Americans, Native Americans and LGBTQ adults.

For years, doctors have focused on detecting breast cancer at the earliest possible moment after a tumor develops so treatment can start right away. But more and more studies are showing many small, early tumors don't present a danger.

So, when is it safe to remove a tumor but skip additional treatments like tamoxifen, chemotherapy and radiation?

House Republicans have passed a bill to replace the Affordable Care Act. If it is signed into law, the American Health Care Act will affect access to health care for millions of people in the U.S.

Rep. Tom Price, a Georgia Republican, is President-elect Donald Trump's pick for Secretary of Health and Human Services. He is currently chairman of the powerful House Budget Committee.

Price, an orthopedic surgeon for nearly 20 years before coming to Congress, has represented the northern Atlanta suburbs in the House of Representatives since 2005.

There's a major gap between what parents view as quality child care and what developmental psychologists and other specialists define as good care. That's according to a poll released this week by NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health.

Parents' views of child care are a little like life in Lake Wobegon — the vast majority say it's way above average.

That's just one of the findings in a poll looking at child care and health from NPR, the Robert Wood Johnson Foundation and the Harvard T.H. Chan School of Public Health, released Monday.

In it, we found that a remarkable 88 percent rated their child care as "very good" or "excellent."

The Food and Drug Administration is recommending that blood banks screen all blood donations in the U.S. for the Zika virus.

It's a major expansion from a Feb. 16 advisory that limited such screening to areas with active Zika virus transmission.

In a statement released Friday, the FDA says all those areas are currently in compliance with blood screening, but that expanded testing is now needed.

Employers' efforts to reduce stress get low grades in a new poll by NPR, the Robert Wood Johnson Foundation and Harvard's T.H. Chan School of Public Health.

In particular, among those working adults who say they've experienced a great deal of stress at work in the past 12 months, the vast majority, 85 percent, rate the efforts of their workplace to reduce stress as fair or poor.

A germ that can't be treated with an antibiotic that is often used as the last resort has shown up for the first time in the United States.

Government scientists say the case is cause for serious concern but doesn't pose any immediate public health threat.

The germ was discovered in a 49-year-old woman in Pennsylvania with a urinary tract infection. The infection was caused by E. coli bacteria that had a gene that made them resistant to an antibiotic known as colistin.