C.D.C. Reverses Testing Guidelines for People Without Covid-19 Symptoms

The agency now says anyone exposed to an infected person for more than 15 minutes needs a test. An earlier guideline saying it might not be necessary had shocked public health experts.

9h

How to Ship a Vaccine at –80°C, and Other Obstacles in the Covid Fight

Developing an effective vaccine is the first step. Then comes the question of how to deliver hundreds of millions of doses that may need to be kept at arctic temperatures.

9h

‘This Does Not Look Good for Children’: Fires Pose Risk to Young Lungs

The wildfires blazing in the West could hinder developing lungs, worsen asthma and even lead to the condition in those who don’t have it but are genetically disposed to it.

13h

Medical Errors May Increase Around Daylight Saving Time in the Spring

After the loss of an hour from daylight savings, the number of human mistakes increased by almost 20 percent, mostly involving drug errors.

13h

Emails Detail Effort to Silence C.D.C. and Question Its Science

Emails from a former top Trump health official and his science adviser show how the two refused to accept Centers for Disease Control and Prevention science and sought to silence the agency.

14h

Live Covid-19 Tracker and Updates

President Trump acknowledged that an authorized vaccine for ‘every American’ may not be distributed until next year. Nearly 1,000 casino employees have tested positive in Las Vegas.

14h

Covid-19 News: Live Updates

Israel becomes one of the few countries to impose a second nationwide lockdown. In the U.S., Joe Biden tries to focus the campaign on President Trump’s virus performance.

17h

The New Apple Watch Measures Your Blood Oxygen. Now What?

Blood oxygen readings can be a useful indicator of wellness, but context is important — and so is medical advice from a doctor.

23h

Reproductive Life Span May Affect a Woman’s Heart Risks

Women with a shorter time between menarche and menopause were at higher risk of cardiovascular disease, heart attack and stroke.

23h

Many Hospitals Charge More Than Twice What Medicare Pays for the Same Care

The gap between rates set for private insurers and employers vs. those by the federal government stirs the debate over a government-run health plan.

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