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Explained

Sex, immunity and the brain

Differences between the immune systems of males and females — in particular, ones involving cells called microglia — might help explain why the risk for conditions such as autism and Alzheimer’s varies between the sexes

Genes and heart disease: Finally making the link

Polygenic risk scores — a patient’s chance, based on tiny DNA variants, of developing cardiovascular disease, breast cancer and more — are coming to clinics. But there are kinks to iron out and accuracy remains an issue.

I got the Pfizer Covid-19 vaccine. Or maybe not.

OPINION: Many Americans say they won’t take a vaccine. I am not one of <br xmlns="http://pub2web.metastore.ingenta.com/ns/"/>them — and I have the shots to prove it.

The challenges of antiviral treatments

Antibiotics abound, but virus-fighting drugs are harder to come by, and Covid-19 amply shows how much we need them. Fortunately, scientists are getting better at making and finding them.

Covid, RSV and the flu: A case of viral interference?

The ‘tripledemic’ unfolding this winter is one of several odd trends among respiratory virus infections these last years. Viruses, it turns out, can block one another and take turns to dominate.

Know thine enemy: Why genetic sequencing is key to tracking Covid-19

The US effort to analyze viral genomes, slow to start, is now picking up speed

All about cholesterol

The latest science on how blood levels of HDL, LDL and more relate to cardiovascular health

Progress fighting pancreatic cancer — one of the deadliest malignancies

Better outcomes may come from new drugs, strategies to rev up the immune system and learning to identify the disease sooner in its course

Everything you need to know about bird flu

How dangerous is it? Where did it come from? H5N1 influenza’s origins stretch back to the 1990s, and key events paved the way for the outbreak we’re seeing today.

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