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Child care providers around the country have been hit hard by the coronavirus pandemic, with many facing closure even as others struggle to stay open.

At least 12 states have shuttered all child-care except for essential workers according to The Hunt Institute, an education non-profit. In California, the decision is up to each individual provider, who must balance the needs of families with the health and safety of workers and children.

Editor's note: NPR will be publishing stories from this investigative series in the weeks ahead as we focus our current coverage on the coronavirus pandemic. But here's a look at some of our key findings. You can watch the full documentary film from this investigation right now on the PBS series Frontline.

Michelle Kuppersmith feels great, works full time and exercises three to four times a week. So she was surprised when a routine blood test found that her body was making too many platelets, which help control bleeding.

Kuppersmith's doctor suspected the 32-year-old Manhattanite had a rare blood disorder called essential thrombocythemia, which can lead to blood clots, strokes and, in rare cases, leukemia.

When infectious pathogens have threatened the United States, the Centers for Disease Control and Prevention has been front and center. During the H1N1 flu of 2009, the Ebola crisis in 2014 and the mosquito-borne outbreak of Zika in 2015, the CDC has led the federal response.

Facebook, YouTube and Twitter are relying more heavily on automated systems to flag content that violate their rules, as tech workers were sent home to slow the spread of the coronavirus.

So far, the coronavirus has hit hardest in wealthy countries. But the pandemic now appears poised to explode in many parts of the developing world — which has far fewer resources to combat the virus.

The virus initially traveled outward from China to places that had the most interaction with China. These are the richer parts of East Asia — South Korea, Japan, Taiwan, Singapore — along with Europe and the United States. All these places had lots of flights, business dealings and tourism with China.

The coronavirus pandemic has led to the panic-buying of one item in particular: toilet paper.

Stores have been rationing the goods, in some cases, doling out as little as one roll apiece. This sudden demand for what some are calling "white gold" is proving a challenge — and an opportunity — for one fledgling family business in a Maine, where the paper industry has seen some hard times.

Three major health insurance providers have now pledged to shield patients from high medical bills if they need treatment for COVID-19. Insurers Cigna and Humana announced Monday that they would waive consumer costs associated with COVID-19 treatment.

Mexican President Andrés Manuel López Obrador told his countrymen this weekend, in video announcements, "Don't go out into the streets unless it's for something absolutely necessary." But the president, who's been slow to acknowledge the new coronavirus threat, drew sharp criticism for failing to model good social distancing.

As recently as eight days ago, López Obrador urged Mexicans to go out to eat in restaurants, out of concern over an economic fallout from the virus.

In communities where most coronavirus tests are coming back positive, it's a sign there are many more cases there that haven't been found, say World Health Organization officials in a press conference on Monday.

"If 80-90% of the people test positive, you are probably missing a lot of cases," says Michael Ryan, executive director of the WHO Health Emergencies Program.

House Speaker Nancy Pelosi, D-Calif., said House members are in the information-gathering stage of a fourth coronavirus response bill, but it could be several weeks before the lower chamber takes up the legislation.

Pelosi also said she would not be tested for the virus, even after a member who attended events with her on Friday is presumed to have a coronavirus infection.

Updated at 6:15 p.m. ET

President Trump warned Americans on Monday to prepare for more disruption and death as he and other authorities extended mitigation procedures for several more weeks amid the widening coronavirus disaster.

Trump acknowledged on Sunday that his goal for a return to normalcy by Easter won't happen, and he extended the federal guidelines for social distancing and mitigation to April 30. He said on Monday that the pandemic will take longer than he hoped to abate.