Under healthy-swimming guidance, when should swimmers stay out of the water?

Swimmers should stay out of the water if they have diarrhea because it poses a significant health risk not only to the individual but also to others in the pool. Diarrhea can lead to the presence of harmful bacteria and viruses in the water, increasing the likelihood of waterborne illnesses that can be transmitted to other swimmers. This precaution is a key component of healthy-swimming guidelines to maintain pool hygiene and ensure the safety of all patrons.

In contrast, wearing contact lenses does not inherently pose a health risk in the water, although swimmers should always take precautions to protect their vision. Eating before swimming is typically acceptable unless a swimmer feels uncomfortable. Lastly, having sunscreen applied is also not a reason to stay out of the pool; in fact, sunscreen is recommended to protect the skin from UV rays while swimming.