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The saliva circulating in your mouth contains troves of microbial information about the rest of your body and is easier to collect than blood samples. Today, a few drops of spit can help detect ...

Your saliva is "like a microbial fingerprint," says Purnima Kumar, a spokesperson for the American Dental Association. But it also changes if you take a sip of water or coffee. (dusanpetkovic | Getty ...