Collective outbreak of severe acute histoplasmosis in immunocompetent Chinese in South America: the clinical characteristics and continuous monitoring of serum cytokines/chemokines oleh Yin-yin Peng, Shu-liang Guo, Xiao-feng Yan, Lv-lang Zhang, Jing Wang, Guo-dan Yuan, Gang Qing, Lu-lu Xu, Qian Zhan