US researchers said that women experiencing much stress develop a weaker immune response to the HPV virus. HPV is a sexually transmitted infection that has progress to cancer on some women who had it. While many women appear to be able to clear the virus from their bodies, others developed a persistent infection that creates an abnormal cell changes which has every possibility to lead to cancer. In some women, their immune system was not able to clear the virus. It was found that the immune system was poorer to women who reported higher levels of day to day stress. Women with high level of stress are more likely to develop an impaired immune response to diseases.
reference: http://news.bbc.co.uk/2/hi/health/7247653.stm
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