伤寒病人解除隔离的主要标准是（）

A.体温下降

B.血培养转为阴性

C.体征消失

D.肥达反应阴转

E.症状消失，大便培养连续2次阴性（间隔5日）

A female client is discharged from the hospital after having an episode of heart failure. She’s prescribed daily oral doses of digoxin (Lanoxin) and furosemide (Lasix). Two days later, she tells her community health nurse that she feels weak and frequently feels her heart "flutter. " What action should the nurse take ？（）

A．Tell the client to rest more often.

B．Tell the client to stop taking the digoxin, and call the physiciarn.

C．Call the physician, report the symptoms, and request to draw a blood sample to determine the client’s potassium level.

D．Tell the client to avoid foods that contain caffeine.