Everyone wants to be done with Covid. But no single milestone will signal the end of the virus.
A global fungal pandemic wiped out amphibians, destroyed biodiversity, and ultimately increased human illness. Now a second similar pathogen is on the way.
Are the vaccines working, are people changing their social behavior, is the virus burning itself out—and how will we know?
Blistering temperatures and the invasion of Ukraine have fed fears of global shortages—but some regions are suffering much more than others.
For every person paralyzed, hundreds or thousands could be infected. It’s a setback for the long-overdue plan to eradicate the virus from the world.
Following a White House declaration of emergency, the US is at a crossroads in how it responds to the virus. Each scenario has wildly varying results.
The zoonotic disease is now spreading from person to person. But if it finds a home in new wildlife species, it could settle in to become a permanent risk.
The strategy, which involves inoculating an infected person’s closest contacts, helped beat smallpox. But it requires good contact tracing and enough vaccines.
As Covid swept ICUs, doctors prescribed antibiotics to ward off secondary infections. Now bacteria have evolved resistance—but hospitals are fighting back.
Under the Constitution, federal laws overrule state ones. But challenges to medication abortion will test the agency’s ability to make nationwide regulations.