Wastewater from an Australian campus of 30,000 shows oxidative stress marker rise during exams
Researchers analysed wastewater from a campus of about 30,000 people in 2022 and found a university-specific rise in 8-OHG during exams; antidepressant trends were not significant.
A study published on nature.com reports that wastewater from an Australian university campus carries a measurable chemical signature of examination stress. Samples were collected in 2022 from a campus of about 30,000 people. The authors compared the examination period with teaching periods and with a contemporaneous general-population catchment of about 120,000 residents nature.com
nature.comnature.comOpen source ↗.
The motivation, according to the authors, is that academic stress may affect mental health and coping behaviours, while population-level monitoring relies on self-reports or prescription data with limited temporal resolution.
Biomarkers measured in wastewater
The team analysed oxidative stress biomarkers, antidepressants and attention deficit hyperactivity disorder medication. They also measured behavioural indicators: alcohol, nicotine and tobacco biomarkers, paraxanthine (a caffeine biomarker) and acesulfame. Temporal patterns during the examination period were compared with teaching periods and with the general-population catchment using a difference-in-differences analysis.
What changed during the examination period
The analysis showed a marked university-specific increase in 8-hydroxyguanine (8-OHG). Evidence for 8-hydroxy-2′-deoxyguanosine (8-OHdG) was weaker nature.com
nature.comnature.comOpen source ↗. Antidepressant consumption trends were consistently positive but not statistically significant.
Ritalinic acid and amphetamine, total nicotine and tobacco-derived nicotine, and alcohol remained relatively stable. Paraxanthine and acesulfame decreased significantly.
The signal reflects the whole sewage catchment of the campus, with about 30,000 people, compared against a general-population catchment of about 120,000 residents. The authors conclude that, by integrating multiple biomarkers, wastewater surveillance can serve as a non-invasive and complementary tool for identifying periods of increased mental health burden in university populations and for informing timely public health interventions.
