What is the isolation requirement for polio?

The correct understanding of the isolation requirement for polio is that it is necessary to isolate individuals until the symptoms subside. This is because polio is a contagious viral infection that can be transmitted from person to person, particularly through fecal-oral routes. The isolation period is important to prevent further spread of the virus during the time when a person is still exhibiting symptoms.

While it may seem that a specific time frame like one week could suffice, the focus is really on the cessation of symptoms as the key indicator for ending isolation. This approach ensures that individuals who are still capable of transmitting the virus are kept away from others to minimize the risk of outbreak.

As such, the other options fall short because they either suggest an insufficient isolation period or imply that no precautions are necessary, which could facilitate the spread of this potentially debilitating disease. The emphasis here is on complete recovery before release from isolation, emphasizing public health and safety.