And there's a simple trick, they say, to defeating colds and the flu.
In the study, published intoday, the researchers found that just a nine degrees Fahrenheit drop in temperatures can kill almost 50 percent of the cells that fight bacteria and viruses inside the nostrils.
In theory, at least, the results are compelling. The team of researchers found that extracellular vesicles , small versions of cells that aren't able to divide like regular cells, can ward off respiratory viruses and invading bacteria in the nostrils.
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