Faulty plumbing and a poorly designed air ventilation system were believed to be factors in a 2003 Severe Acute Respiratory Syndrome (SARS) outbreak. The system allowed the virus, SARS-CoV-1, to be aerosolized in faecal matter and enter multiple apartments through improperly functioning bathroom drains (WHO report). Given that SARS-COV-2 is very closely related to SARS-CoV-1, there are concerns that COVID-19 might be transmitted in the same way. Faeces could also potentially become aerosolized or released into the air in droplets as a result of mechanized emptying of on-site sanitation systems or toilet flushing. However, risk to users of household toilets and sanitation workers is considered to be low based on current occurrence and survival data of SARS-CoV-2 in faeces.
WHO recommends flushing toilets with the lid down, especially in health facilities treating patients and the use of standard, well-maintained plumbing and wastewater treatment systems. Plumbing systems should include sealed bathroom drains and backflow valves on sprayers and faucets to prevent aerosolized faecal matter from entering the plumbing or ventilation system.
Want to know more about faecal-oral transmission of COVID-19?
- What is faecal-oral transmission?
- How long can SARS-CoV-2 persist in the environment?
- Amount of infectious virus shed in faeces and infectious dose
- Has SARS-CoV-2 been detected in human faeces?
- How do we detect COVID-19 in human faeces?
- If COVID-19 is a respiratory disease, why would it be detected in faeces?
- Are there special considerations for sanitation and COVID-19?
- Do sanitation workers need to take special precautions while handling faecal waste?
- Guidance for sanitation workers
- Can water sources be contaminated with SARS-Cov-2?
- Guidance for water treatment
- Water quantity