Flushing the toilet can release a ‘plume’ of breathable pathogens – and closing the lid won’t stop their escape
Source: Guardian Health ↗
Flushing a toilet can generate a turbulent plume of aerosol particles that reach the breathing zone of adults and remain suspended for at least 20 seconds, according to a new review of 22 studies published by Flinders University researchers in the journal Science of the Total Environment. The analysis found that microbes present in the flush water or on the bowl surface become airborne as bioaerosols capable of carrying pathogens such as Legionella, influenza virus and norovirus. More vigorous, high‑volume flushes produced greater turbulence and consequently released larger quantities of particles, creating a potential inhalation exposure pathway. Lead author Lira Adiyani, a PhD student, emphasized that while closing the toilet lid may reduce the plume, it does not fully prevent aerosol escape, and she still recommends the precautionary step of lowering the lid after use.
The review highlights that indoor aerosol generation from toilets has been “understudied” despite its implications for infection risk, building design and public health, especially as water‑security pressures increase the use of recycled or rainwater that may harbor opportunistic pathogens. Co‑author Harriet Whiley noted that healthy individuals are unlikely to be harmed in private homes, but immunocompromised occupants could suffer severe illness or death from inhaled microbes. The researchers call for designs that achieve an effective flush with reduced volume and turbulence, aiming to protect vulnerable populations in settings such as hospitals and aged‑care facilities where exposure risk is higher.
Commentators not involved in the study warned that the toilet environment extends beyond the bowl, with doors, floors, walls and even personal devices becoming contaminated. Dr Lotti Tajouri, an associate professor in molecular genetics, described the “plume” effect as an “explosion” of aerosols that can spray users when the lid is raised, and he stressed that subsequent contact with surfaces—such as the toilet door, faucet, hairdryer and mobile phone—can spread fecal microorganisms like salmonella and campylobacter. He cited studies indicating that 50‑80 % of people use their phones in the bathroom, a behavior that can further disseminate pathogens. The combined findings suggest that while simple measures like closing the lid and diligent hand‑washing can mitigate exposure, broader hygiene practices and engineered solutions are needed to limit aerosol‑borne transmission in both private and public restrooms.
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The U.S.'s central bank rate currently stands at 3.75%, so a global rates move like this could feed through to local borrowing costs. The U.S.'s economy is growing at 2.3% with inflation at 3.2%, the backdrop this story's effects play out against locally. Housing-market effects like this are usually felt most where mortgage rates track the U.S.'s own central bank rate closely. With the U.S.'s unemployment at 4.4%, personal-finance effects like this land on a labour market that is currently fairly stable. Health-system effects are harder to localise from economic indicators alone — the real impact in the U.S. depends more on local healthcare capacity than the figures above.
The UK's central bank rate currently stands at 3.75%, so a global rates move like this could feed through to local borrowing costs. The UK's economy is growing at 0.8% with inflation at 3.2%, the backdrop this story's effects play out against locally. Housing-market effects like this are usually felt most where mortgage rates track the UK's own central bank rate closely. With the UK's unemployment at 5.6%, personal-finance effects like this land on a labour market that is currently fairly stable. Health-system effects are harder to localise from economic indicators alone — the real impact in the UK depends more on local healthcare capacity than the figures above.
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