Rhinovirus

stressful task, which is compared with a benign task that is not stressful. As was done in a clever recent experiment, the researcher could show that the group under stress is more likely to catch cold when subjects are placed in direct contact with a rhinovirus in the laboratory.12 The natural conclusion is that stress increased the likelihood that a subject will catch cold if exposed to the cold virus. The difficulty of demonstrating causality applies less to the experimental manipulation of variables

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