Microbiologist Exposes Shocking Bacterial Growth in Gym Showers

On November 14, 2025, a microbiologist's disturbing findings about the bacterial growth in gym shower floors went viral, sparking concerns about hygiene and health risks for gym-goers.

Nick Aicher, a Chicago-based senior quality control analyst, recently conducted an experiment to test the bacteria levels on a gym shower floor. In a video that has garnered nearly 14,000 views, Aicher swabbed the floor and incubated the sample, only to be confronted by a thick presence of bacterial growth.

Aicher's findings align with warnings from experts about the germ-rich environments in gyms. Dr. Primrose Freestone, a senior lecturer in Clinical Microbiology at the University of Leicester, explains that "anywhere there's sweat, there are probably germs." The most common disease-causing bacteria found in gyms is Staphylococcus aureus, which can trigger MRSA, a serious and potentially life-threatening infection.

Salmonella, a bacteria that can cause severe diarrhea, stomach cramps, and even fatal dehydration, has also been detected on gym equipment. Additionally, experts caution that gyms can harbor viruses that lead to conditions like verrucas and athlete's foot.

While some viewers were surprised the results were not worse, Aicher's video serves as a stark reminder of the importance of proper hygiene and precautions when using gym facilities. The microbiologist's findings have sparked a renewed focus on the need for improved cleaning and sanitation practices in gyms to protect the health and safety of their patrons.