A new study suggests that climate change may be increasing the risk of exposure to sewage-associated viruses in rivers, lakes, and coastal waters. The research, conducted by scientists including Jessica Kevill, found that extreme weather events such as heavy rainfall and heatwaves can cause untreated sewage to enter natural water bodies, posing a significant health threat.
Viruses like norovirus and adenovirus, which cause stomach illnesses, were found to persist in seawater for up to three days in high temperatures and even longer in cooler conditions. On cloudy days, these viruses remained viable for about 2.5 days, while sunlight exposure reduced their survival to less than 24 hours.
Scientists warn that with increasing climate-related weather extremes, the risk of sewage contamination is likely to rise, affecting public health. The study calls for improved sewage treatment systems and stronger global policies to address the growing threats posed by climate change.