Umair Irfan
Former correspondent
Latest articles by Umair Irfan
A Nobel Prize winner coauthored a study in a major journal. More than 40 researchers want it retracted.
The coronavirus is undermining efforts to control rainforest fires in Indonesia and Brazil. And those fires could worsen the pandemic.
Scientists still want to see the data behind the clinical trial.
Shutdowns prevented new coronavirus infections and saved lives, but it may be harder to use them again.
New daily Covid-19 cases have been climbing for more than two weeks, and hospitalizations are also on the rise.
In the United States, the public health measures averted 60 million infections, researchers found.
Never waste a crisis.
Humans are causing a mass extinction. And humans can stop it.
We need to plan for many different Covid-19 vaccine scenarios. These four factors will influence the outcome.
It’s hard to find a disease that’s rare.