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More than 80 million Americans have contracted COVID, and as many as one-third were left with lingering symptoms. Maybe brain fog, or unremitting fatigue.

Paul Spiegel, director of the Center for Humanitarian Health at the Johns Hopkins Bloomberg School of Public Health, spent more than six weeks in Poland and other countries neighboring Ukraine as part of a World Health Organization surge team, acting as emergency coordinator for refugee health.

One million people have now died in the U.S. because of COVID-19, according to NBC News' latest tally. It would have been impossible to imagine that death toll just over two years ago, when the novel coronavirus began spreading around the world.
 

SARS-CoV-2 remains a long way from being ordinary. It has not yet found seasonal cadence — take the recent surge in Europe and the U.K., which comes just weeks after the initial Omicron wave subsided — and it’s still capable of inflicting mass death and disability (see Hong Kong’s lethal last few months).
 

Researchers don’t fully understand the menstrual cycle’s effects on the immune system, but experts say there are reasons some may feel sick at certain points.
 

Two new Omicron variants sweeping South Africa—likely able to evade vaccines and natural immunity from previous infections—have been identified in the U.S., multiple COVID-19 researchers told Fortune.
 

Gigi Gronvall discusses how far we’ve come in securing pathogenic specimens and the role of misinformation in promoting fears around the development of bioweapons.

Although mandates and recommendations for wearing masks to prevent the spread of COVID-19 have changed over the past several months, it is still considered safe to go maskless at crowded outdoor events.
 

Americans are hearing mixed messages on the pandemic as the country moves into a new phase of a more than two-year battle against the coronavirus.

An invisible wave is possible because cases capture only the number of people who test positive for the virus, which is different from what epidemiologists really want to know: how many people are infected in the general population.
 

On April 11, Shanghai sectors were categorized into three types of zones — lockdown zones, controlled zones and precautionary zones — based on their total positive cases, according to the state-controlled China Daily.
 

Daniel Webster from the Johns Hopkins Center for Gun Violence Solutions talked about his research and approaches to reducing gun violence.