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Now laughter, like yawning and vomiting, is another contagious behavior.
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According the National Eating Disorders Association, more than half of American teenage use unhealthy methods like cigarettes, laxatives, vomiting, and self-starving to lose weight.
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And also, that Facebook friends aren't the same as real friends, because real friends come over to your house and they, like, hold your hair when you're vomiting.
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Symptoms can include fever, vomiting, diarrhea, abdominal pain, headache, a measles-like rash, red eyes and, at times, bleeding from body openings.
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"Symptoms include flu-like symptoms like tiredness, general aches and pains, headaches and fever, as well as loss of appetite, nausea or vomiting, diarrhoea, abdominal pains, jaundice, very dark urine and itchy skin, " he said.
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