Critical illnesses requiring continuous nursing should involve at least two nurses to ensure adequate rest, fresh air exposure, and proper ventilation.

Original passage

Where the illness is serious, requiring the attendance of a nurse night and day, the work should be shared by at least two efficient nurses, so that each may have opportunity for rest and for exercise in the open air. This is especially important in cases where it is difficult to secure an abundance of fresh air in the sickroom. Through ignorance of the importance of fresh air, ventilation is sometimes restricted, and the lives of both patient and attendant are often in danger.