People across cultures can tell when others are in the early stages of infection by looking at them. Scientists studied 169 volunteers from six different cultural backgrounds, including city dwellers in Stockholm and hunter-gatherers in the rainforests of Thailand and Malaysia

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I find this interesting as I have been fairly accurate doing this, generally though I can smell the infection. People usually are like I have allergies or I’m not feeling good, if it’s an infection though I swear I can smell it on them.