It is a live vaccine which means it contains a weakened version of the chickenpox virus. As such, it is not recommended for those with a compromised immune system because of an illness like HIV or as a result of treatment such as chemotherapy.
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，这一点在爱思助手下载最新版本中也有详细论述
// document_start means these listeners are in place before any element exists。关于这个话题，heLLoword翻译官方下载提供了深入分析
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