Tuesday, May 12, 2020

Human Behaviour Or Pressurized Flush Toilets And Closed Loop Air Conditioning?


nature |  Human behaviour is central to transmission of SARS-Cov-2, the virus that causes COVID-19, and changing behaviour is crucial to preventing transmission in the absence of pharmaceutical interventions. Isolation and social distancing measures, including edicts to stay at home, have been brought into place across the globe to reduce transmission of the virus, but at a huge cost to individuals and society. In addition to these measures, we urgently need effective interventions to increase adherence to behaviours that individuals in communities can enact to protect themselves and others: use of tissues to catch expelled droplets from coughs or sneezes, use of face masks as appropriate, hand-washing on all occasions when required, disinfecting objects and surfaces, physical distancing, and not touching one’s eyes, nose or mouth. There is an urgent need for direct evidence to inform development of such interventions, but it is possible to make a start by applying behavioural science methods and models.

In addition to industrial aerosolizing flush toilets https://waterandhealth.org/disinfect/preventing-infection/can-coronavirus-spread-through-defective-bathroom-sewage-pipes/ do you know whether your office building or apartment complex has electrostatic filters and outside fresh air exchangers?

Here is a study on an early transmission site in China, where incidents of infection seem to correlate to ventilated air flow in a restaurant: COVID-19 Outbreak Associated with Air Conditioning in Restaurant, Guangzhou, China, 2020 https://wwwnc.cdc.gov/eid/article/26/7/20-0764_article

This illustration helps to visualize this: https://wwwnc.cdc.gov/eid/article/26/7/20-0764-f1  Here is a not-yet-reviewed preprint of a study of two buses transporting attendees to and from an event in China. One bus (#2) had a suspected “index patient” (IP), the other didn’t.  https://twitter.com/zeynep/status/1255579524047220741
From the article: “In both buses and conference rooms, central air-conditioners were in indoor re-circulation mode.”   Untreated recirculated air bearing virus-laden droplets may lead to repeated exposure and increase concentration of virions in individuals.

66% of hospitalized New Yorkers had no travel or contact with external 3rd parties, i.e., they were self-quarantined. What they had in common was that they were apartment dwellers living in comparatively high density with shared spaces and a shared plumbing system. 

Their behavior was of no consequence WHATSOEVER when it came to mitigating or limiting their exposure to the SARS-Cov2 pathogen, aerosolized via plumbing and concentrated and recirculated via air conditioning.