The FDA has approved a nasal spray flu vaccine for home use. Here's how it works, and when it will be available.

A no-frills nasal spray could potentially provide effective protection against "deadly respiratory infections" and Covid-19, tests on mice suggest. In findings published in the journal Advanced Materials,

If this flu-busting nasal spray lives up to its promise, it will be a blockbuster. Scientists at Harvard Medical School have developed a simple nasal spray, made of harmless ingredients, that they reckon can protect us against flu,

Harvard scientists developed a nasal spray, PCANS, which can trap and deactivate pathogens, showing promise in respiratory illness prevention.

Most respiratory viruses, like the flu and COVID-19, enter the body through the nose. When an infected person exhales, sneezes, coughs, or even laughs, they release droplets containing the virus, which others can inhale. These pathogens attach to the nasal lining, replicate, and are further spread.

The Food and Drug Administration (FDA) has approved the first nasal spray flu vaccine which can be administered by the patient or a caregiver. FluMist, produced by European pharmaceutical company and Covid vaccine-maker AstraZeneca, was announced last week and can be used by adults aged 49 and under.