"For example, it is common to screen new house staff and nurses in medical centers to determine whether any individuals face special risks of contagion, such as immunosuppression or pregnancy. Those at high risk may then be asked to avoid certain treatment situations, materials, or hospital areas.(...) Protecting immunosuppressed providers is reasonable "risk management", a measure taken to reduce bad outcomes. But such special protection supports the claim that only standard risks are included in the duty to treat.(...) Some nosocomial risks clearly take us beyond what duty requires."