Knvul Sheikh

Researchers are just beginning to understand the cognitive dysfunction that some people experience with Covid-19 and a range of other health issues.

Experts weigh in on how long immunity lasts after an infection — or vaccination.

Recent research suggests that people who work out have stronger resistance to infectious diseases — including Covid — but experts say the findings need to...

There are ways to figure out what you’ve been vaccinated for, even if you have no hope of finding the original records.

Here is what experts say about how the virus is transmitted during everyday interactions — and which behaviors carry the most risk.

A guide to finding the medical care you may need during the current outbreak.

Some reinfection questions, answered.

In many places, there is no system for sharing home test results with health officials, but the information may still be beneficial for public health.

This viral illness is not like Covid, but there is cause for concern. Here’s how experts are thinking about it now.

The study could pave the way for newborn screening — but the results still need to be corroborated by further research.