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2. Skip the Germ-Filled Plane

Many travelers swear they get sick every time they go on vacation. While they could attribute that to unfamiliar foods or overindulgences, the plane could be to blame. According to the Journal of Environmental Health Research, cold germs are 113 times more likely to be transmitted on an airplane than on the ground. The Wall Street Journal reported that the risk of catching a cold goes up 20% after flying. The culprits? Shared air, close quarters, and low cabin humidity, which dries out nasal passages.

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