Which activity can contribute to the spread of swimmer's ear?

Swimming in contaminated water can indeed contribute to the spread of swimmer's ear, which is an infection of the outer ear canal often caused by bacteria or fungi. When individuals swim in water that is not properly treated and contains harmful microorganisms, these pathogens can enter the ear canal and lead to infections. Contaminated water can originate from a variety of sources, including poorly maintained pools, lakes, or even hot tubs, where hygiene practices might not be adequately followed.

While chlorinated water and well-balanced pools are generally effective in controlling bacteria, exposure to high pH levels might affect the skin's natural defenses but is less focused on the direct transmission of infections when swimming. The primary concern for swimmer's ear is the water quality and presence of harmful microorganisms, making swimming in contaminated water a significant risk factor for developing this condition.