APOORVA MANDAVILLI

The patients turning up at clinics often have a range of symptoms that are not typical of the infection. Some of the infected seem to...

Before its discovery in New York’s wastewater, the virus made a series of ominous appearances around the world.

Federal officials are not relying on an established system to distribute the vaccine, slowing immunizations and burdening local health departments, critics say.

Doctors who want to prescribe tecovirimat, or Tpoxx, must navigate a gantlet of bureaucratic hurdles that experts say could be quickly lifted.

People with H.I.V. and other immune-system problems may need the full two-dose regimen, researchers say. But the shots, particularly second doses, are hard to come...

Containing the outbreak, scientists say, will depend on better understanding the virus’s transmission and how well available tools work.

The doses were withheld pending an F.D.A. review, which has now been completed.

There have been more than 16,000 cases outside Africa, and the virus has reached 75 countries and territories.

The Omicron variant is evolving in ways that make it better able to evade the body’s immune defenses. But booster shots still help prevent severe...

Longstanding weaknesses in the public health system are giving the virus a chance to become entrenched.