Only half of volunteers deliberately exposed to SARS-CoV-2 developed an infection. None developed serious symptoms, paving the way for further challenge trials.

Two studies this month point to pooches’ quick detection of SARS-CoV-2 on material that touched the skin of infected participants, although the pups’ accuracy does not match that of RT-PCR.

Some viruses, possibly even SARS-CoV-2, can sneak into the brain through the nose. Recent studies show that microglia are ready for them when they do.

Using optogenetics, scientists have simulated the sense of smell directly within the mouse brain to investigate the nature of olfactory perception.

In mice, a group of nasal epithelial cells called brush cells release pro-inflammatory signals in response to allergens.

Lab-grown stem cells fill in for damaged tissue in the noses of mice.

Authors of a small study say the two abilities likely evolved in tandem.

In an in vitro study, the compound completely blocked the replication of rhinoviruses.

Climate variation has sculpted our schnozzes since the earliest humans evolved, but environmental pressures can’t explain everything.