患者女,71岁,因间断发热1年余,乏力1周入院。1年前患者间断出现发热,时有咳嗽咳痰,每次经应用抗感染药物后病情均有控制。入院1月前患者再次出现发热,体温多波动在38℃,伴咳嗽咳痰,检查双肺CT为:双肺间质改变,肺炎。入院查体:T37.9℃,贫血貌,皮肤黏膜无出血点,浅表淋巴结不大,? Female patient, aged 71, due to intermittent fever more than 1 year, 1 week hospitalized fatigue. A year ago, patients intermittently fever, cough and expectoration, each time after the application of anti-infective drugs have control of the disease. 1 month before admission, patients again fever, body temperature fluctuations in 38 ℃, with cough and sputum, check the lung CT as: interstitial lung changes, pneumonia. Admission examination: T37.9 ℃, anemia, skin and mucous membrane without bleeding, superficial lymph nodes is not large ,?