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FORT LAUDERDALE, FL - JANUARY 06: Gautam Gupta receives an influenza shot from Nurse Practitioner Ray Grigorio in the MinuteClinic at the CVS/pharmacy on January 6, 2014 in Fort Lauderdale, Florida. The 2013-2014 influenza season is starting to take off in the United States, with more than half the country reporting widespread cases of flu activity, according to the US Centers for Disease Control and Prevention. (Photo by Joe Raedle/Getty Images)

We humans have the innate ability to tell whether or not someone is sick, even at the onset of infection. Of course, if someone is doubled over hacking and coughing that’s a telltale sign. But even when someone has initially caught the bug, subtle clues are evident that we have the ability to pick up on. A study was done where individuals viewed photos of people who had just been injected with E coli or a placebo. The viewers were able to successfully differentiate.

Here are some signs: pale lips, a downward turn of the mouth, and droopy eyelids.

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