The last time President Barack Obama was in the White House was on Jan. 20, 2017, when he left to escort his successor — bent on overturning "Obamacare" — to the U.S. Capitol to be inaugurated.

Obama returns to the White House on Tuesday for a moment he can savor: His signature Affordable Care Act is now part of the fabric of the American health care system, and President Joe Biden is looking to extend its reach. Obamacare sign-ups have increased under Biden's stewardship, and more generous taxpayer subsidies have cut costs for enrollees, albeit temporarily.

First came the warnings, in messages among friends and families and on social media, to stock up on vital drugs in Russia before supplies were affected by crippling Western sanctions over the invasion of Ukraine.

Then, some drugs indeed became harder to find at pharmacies in Moscow and other cities.

China has sent more than 10,000 health workers from around the country to Shanghai, including 2,000 from the military, as it struggles to stamp out a rapidly spreading outbreak in its largest city under its zero-COVID strategy.

Shanghai was conducting a mass testing of its 25 million residents Monday as what was announced as a two-phase lockdown entered its second week. Most of eastern Shanghai, which was supposed to re-open last Friday, remained locked down along with the western half of the city.

About 16 million residents in Shanghai are being tested for the coronavirus during the second stage of the lockdown that shifted Friday to the western half of China's biggest city and financial capital.

Meanwhile, residents of Shanghai's eastern districts who were supposed to be released from four days of isolation have been told their lockdowns could be extended if COVID-19 cases are found in their residential compounds.

The city of Shanghai prepared Thursday to reopen its eastern half and shut its western half, while authorities elsewhere announced the lifting of a citywide lockdown in the province hit hardest by China's ongoing omicron-driven coronavirus outbreak.

Residents of the city of Jilin will be able to move about freely starting Friday for the first time in more than three weeks, state broadcaster CCTV said, citing a notice issued by the city. They will be required to wear masks and, when indoors, stay one meter (three feet) apart. Public gatherings in parks and squares are prohibited.

As millions of people in Shanghai line up for coronavirus tests, authorities are promising tax refunds for shopkeepers in the closed-down metropolis and to keep the world's busiest port functioning to limit disruption to industry and trade.

This week's shutdown of most activity in China's most populous city to contain virus outbreaks jolted global financial markets that already were on edge about Russia's war on Ukraine, higher U.S. interest rates and a Chinese economic slowdown.

To administer this COVID test, Todd Kautz had to lay on his belly in the snow and worm his upper body into the narrow den of a hibernating black bear. Training a light on its snout, Kautz carefully slipped a long cotton swab into the bear's nostrils five times.

For postdoctoral researcher Kautz and a team of other wildlife experts, tracking the coronavirus means freezing temperatures, icy roads, trudging through deep snow and getting uncomfortably close to potentially dangerous wildlife.

Hong Kong's deadliest coronavirus outbreak has cost about 6,000 lives this year – and the city is now running out of coffins.

Authorities have scrambled to order more, with the government saying 1,200 coffins had reached the city last week with more to come.

At first glance, the Souq Waqif clinic in the historic center of Doha, the capital of Qatar, could be any other state-of-the-art hospital.

Nurses in blue scrubs move briskly through the bright wards, conducting rounds. Radiology and operating rooms whir with the beeps and blinks of monitors. Specialists squint at X-rays and masked doctors make incisions with all the high-tech tools of modern surgery on hand.

The world is spending nowhere near enough to revive the fight against tuberculosis after the Covid-19 crisis set back years of progress, the WHO said Monday.