“Most public health organizations, including the World Health Organization, do not recognize airborne transmission except for aerosol-generating procedures performed in healthcare settings. Hand washing and social distancing are appropriate, but in our view, insufficient to provide protection from virus-carrying respiratory microdroplets released into the air by infected people,”
‘They don’t want to talk about airborne transmission because that is going to make people afraid’
Read full story at Source: >Coronavirus can float in air — and experts say WHO and CDC should tell people that | KTLA
“Studies by the signatories and other scientists have demonstrated beyond any reasonable doubt that viruses are released during exhalation, talking, and coughing in microdroplets small enough to remain aloft in air and pose a risk of exposure at distances beyond 1 to 2 meters (yards) from an infected individual,”
“For example, at typical indoor air velocities, a 5 nanometre droplet will travel tens of meters, much greater than the scale of a typical room, while settling from a height of 1.5 metres (about five feet) to the floor.” What’s not clearly understood is how important droplet size is to coronavirus transmission,
“A lot of people crowded close together indoors where it is poorly ventilated — that is what drives the pandemic,” … A loud bar, where people must raise their voices to be heard, is a perfect storm of close contact, poor air circulation and people generating a lot of virus-carrying particles by talking, laughing and shouting.
Advice to avoid coronavirus transmission:
“I am very much concerned about the general public and schools and ventilation in school buildings and in dorms on college campuses and in bars and in churches and where people sing and where people congregate,”
• Provide sufficient and effective ventilation (supply clean outdoor air, minimize recirculating air) particularly in public buildings, workplace environments, schools, hospitals and age care homes.
• Supplement general ventilation with airborne infection controls such as local exhaust, high efficiency air filtration, and germicidal ultraviolet lights. (These would be placed high up in the ceiling to avoid damage to people’s eyes and skin)
• Avoid overcrowding, particularly in public transport and public buildings.
“Such measures are practical and often can be easily implemented; many are not costly, For example, simple steps such as opening both doors and windows can dramatically increase air flow rates in many buildings…In buildings, carbon dioxide monitors can help managers know if the air is being refreshed properly.
“In a car, open windows and make sure the air conditioning or heat is not recirculated but set to include outside air.
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