... have been many researchers investigating the effects of stress: Cohen 1991 did research on stress and common cold: - Three hundred and ninety four participants completed a questionnaire to measure their stress level. Participants listed stressful events experienced over the last year, stated how they coped and noted down how often they felt negative emotions such a as depression. They were then put on the 'psychological stress index'. Participants were then given nasal drops, which exposed them to one of five common cold viruses. Most showed signs of infection but on one third were judged by a doctor to having the actual cold. * Results showed that participants with high stress index was more likely to catch a cold- Direct relationship Stress is also known to affect the immune system, which Glaser 1986 proved in his research into how the immune system copes in the exam period. Forty medical students had 6 weeks ...

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