求翻译：ICU医院感染发生率为8．7％，感染中以老年患者居多；感染部位最多的为下呼吸道感染；感染疾病中基础疾病最多的是损伤性疾病；感染致病菌最多的为真菌类；易感因素有抗生素的滥用、创伤性操作、患者机体抵抗力下降等。是什么意思？

Incidence rates of nosocomial infection in ICU for 8. 7% infection in elderly patients, the majority in; infection site up for lower respiratory tract infection; infection diseases underlying disease most damaging diseases; most true fungi infection pathogens; abuse of antibiotic susceptibility factors, reduced body resistance in patients with traumatic operation, and so on.