The coronavirus pandemic -- with a death toll nearing 10,000 -- is not yet under control, a top US health official warned as the nation prepares to enter its most critical week yet in the fight against the outbreak.

President Donald Trump has twice tested negative for the coronavirus, but during a briefing at the White House on Saturday, he said he "may take" the drug hydroxychloroquine against Covid-19. He suggested it has protective effects against the novel coronavirus, although researchers say there's no evidence of that.

Doctors at University Hospital of Brooklyn, New York, explain the dire need for ventilators in the battle against the coronavirus pandemic. CNN's Miguel Marquez reports.

Regulatory changes by President Donald Trump's administration have made it easier for companies to flood the US market with "crappy" tests that are supposed to determine whether someone has recovered from coronavirus, according to the CEO of the Association of Public Health Laboratories.

Covid-19 seems to most seriously affect older people, particularly those with pre-existing conditions such as heart disease, lung disease and diabetes. But it's becoming apparent there are many younger people who still get very sick and die.

In a haunting letter to his friends and colleagues, a Columbia University surgeon describes how coronavirus has forced doctors to ration care for very sick patients who don't have the virus, but still need medical procedures.

From cleaning your home to buying groceries, this is how we can practice social distancing and stay safe during the coronavirus pandemic.

Here are step-by-step instructions on how to make your own mask, based on guidance from the Vanderbilt University Medical Center and Froedtert & the Medical College of Wisconsin. They're reusable and washable, and they should be worn while you continue to obey social distancing measures.

The next two weeks will be crucial in the United States' fight against the coronavirus, warn health officials, who are urging Americans to continue practicing social distancing measures.

When 30-year-old Ben Luderer started to feel sick, he wasn't that surprised. Just a few days earlier, his wife, Brandy, had tested positive for coronavirus, but there wasn't much to it.

Nadia, a tiger at the Bronx Zoo in New York, has become the first of her kind to test positive for the coronavirus.

British Prime Minister Boris Johnson has been admitted to the hospital for tests, Downing Street said Sunday.