{"id":19566,"date":"2021-05-17T01:31:19","date_gmt":"2021-05-16T22:31:19","guid":{"rendered":"https:\/\/bestinsurance.gr\/a1\/?p=19566"},"modified":"2021-05-17T01:31:19","modified_gmt":"2021-05-16T22:31:19","slug":"covid-is-airborne-scientists-say-now-authorities-think-so-too","status":"publish","type":"post","link":"https:\/\/bestinsurance.gr\/a1\/archives\/19566","title":{"rendered":"Covid Is Airborne, Scientists Say. Now Authorities Think So, Too"},"content":{"rendered":"

By Jason Gale<\/span><\/p>\n

(Bloomberg)– A quiet revolution has permeated global health circles. Authorities have come to accept what many researchers have argued for over a year: The coronavirus can spread through the air.<\/span><\/p>\n

That new acceptance, by the World Health Organization and the U.S. Centers for Disease Control and Prevention, comes with concrete implications: Scientists are calling for ventilation systems to be overhauled like public water supplies were in the 1800s after fetid pipes were found to harbor cholera.<\/span><\/p>\n

Cleaner indoor air won\u2019t just fight the pandemic, it will minimize the risk of catching flu and other respiratory infections that cost the U.S. more than $50 billion a year, researchers said in a study in the journal Science on Friday. Avoiding these germs and their associated sickness and productivity losses would, therefore, offset the cost of upgrading ventilation and filtration in buildings.<\/span><\/p>\n

\u201cWe are used to the fact that we have clean water coming from our taps,\u201d said Lidia Morawska, a distinguished professor in the school of earth and atmospheric sciences at the Queensland University of Technology in Brisbane, Australia, who led the study. Likewise, \u201cwe should expect clean, pollutant- and pathogen-free air\u201d from indoor spaces, she said over Zoom.<\/span><\/p>\n

The study\u2019s authors, comprising 39 scientists from 14 countries, are demanding universal recognition that infections can be prevented by improving indoor ventilation systems. They want the WHO to extend its indoor air quality guidelines to cover airborne pathogens, and for building ventilation standards to include higher airflow, filtration and disinfection rates, and monitors that enable the public to gauge the quality of the air they\u2019re breathing.<\/span><\/p>\n

A \u201cparadigm shift is needed on the scale that occurred when Chadwick\u2019s Sanitary Report in 1842 led the British government to encourage cities to organize clean water supplies and centralized sewage systems,\u201d they wrote.<\/span><\/p>\n

\u201cNo one takes responsibility for the air,\u201d Morawska said. \u201cIt\u2019s kind of accepted that the air could be of whatever quality — containing viruses and pathogens.\u201d<\/span><\/p>\n

Speaking, Singing<\/span><\/strong><\/p>\n

SARS-CoV-2 multiplies in the respiratory tract, enabling it to spread in particles of varying sizes emitted from an infected person\u2019s nose and throat during breathing, speaking, singing, coughing and sneezing.<\/span><\/p>\n

The biggest particles, including visible spatters of spittle, fall fast, settling on the ground or nearby surfaces, whereas the tiniest — aerosols invisible to the naked eye — can be carried farther and stay aloft longer, depending on humidity, temperature and airflow.<\/span>
\nIt\u2019s these aerosol particles, which can linger for hours and travel indoors, that have have stoked controversy.<\/span><\/p>\n

Although airborne infections, like tuberculosis, measles and chickenpox are harder to trace than pathogens transmitted in tainted food and water, research over the past 16 months supports the role aerosols play in spreading the pandemic virus.<\/span><\/p>\n

That\u2019s led to official recommendations for public mask-wearing and other infection-control strategies. But, even those came after aerosol scientists lobbied for more-stringent measures to minimize risk.<\/span><\/p>\n

Morawska and a colleague published an open letter backed by 239 scientists last July requesting authorities endorse additional precautions, such as increasing ventilation and avoiding recirculating potentially virus-laden air in buildings.<\/span><\/p>\n

WHO guidance has been amended at least twice since, though the Geneva-based organization maintains that the coronavirus spreads \u201cmainly between people who are in close contact with each other, typically within 1 meter,\u201d or about 3 feet.<\/span><\/p>\n

\u2018Nothing Magic\u2019<\/span><\/strong><\/p>\n

Morawska, who heads a WHO collaborating center on air quality and health, says that\u2019s an oversimplification. \u201cThere\u2019s nothing magic about this 1 meter,\u201d Morawska said. The closer to an infected person, the higher the concentration of infectious particles and the shorter the exposure time needed for infection to occur. \u201cAs you are moving away, the concentration decreases,\u201d she said.<\/span><\/p>\n

Infectious aerosols remain concentrated in the air longer in poorly ventilated, confined indoor spaces, according to Morawska.<\/span><\/p>\n

Although a high density of people in such settings increases the number of people potentially exposed to an airborne infection, enclosed indoor areas that aren\u2019t crowded may also be hazardous — a distinction Morawska says the WHO should make clearer.<\/span><\/p>\n

\u201cThe WHO, step by step, is modifying the language,\u201d she said.<\/span><\/p>\n

Morawska, a Polish-born physicist who was previously a fellow of the International Atomic Energy Agency, can take credit\u00a0 for the WHO\u2019s changing stance, said Raina MacIntyre, professor of global biosecurity at the University of New South Wales in Sydney.<\/span><\/p>\n

\u201cProfessor Morawska\u2019s contribution, on the background of world-leading expertise in aerosol science, made a real impact by forcing WHO\u2019s hand,\u201d MacIntyre said in an email.<\/span><\/p>\n

\u2018Hygiene Theater\u2019<\/span><\/strong><\/p>\n

The role of airborne transmission \u201chas been denied for so long, partly because expert groups that advise government have not included engineers, aerosol scientists, occupational hygienists and multidisciplinary environmental health experts,\u201d MacIntyre wrote in The Conversation last week.<\/span><\/p>\n

\u201cA false narrative dominated public discussion for over a year,\u201d she said. \u201cThis resulted in hygiene theater — scrubbing of hands and surfaces for little gain — while the pandemic wreaked mass destruction on the world.\u201d<\/span><\/p>\n

Some people working in infection prevention and control and related fields have stuck rigidly to beliefs that minimized aerosol transmission, despite evidence challenging their views because \u201cthey do not want to lose face,\u201d said Julian Tang, a clinical virologist and honorary associate professor in the department of respiratory sciences at England\u2019s University of Leicester.<\/span><\/p>\n

\u201cWe all have to adapt and progress as new data become available,\u201d Tang said. That\u2019s especially true in public health, where official policies and guidance based on \u201coutdated and unsupported thinking and attitudes can cost lives,\u201d he said.<\/span><\/p>\n

Morawska said she hopes the attention that the pandemic has drawn to face masks and the risks associated with inhaling someone else\u2019s exhaled breath will be a catalyst for cleaner indoor air.<\/span><\/p>\n

\u201cIf we don\u2019t do the things we are saying now, next time a pandemic comes, especially one caused by a respiratory pathogen, it will be the same,\u201d she said.<\/span><\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

By Jason Gale (Bloomberg)– A quiet revolution has permeated global health circles. Authorities have come to accept what many researchers have argued for over a year: The coronavirus can spread through the air. That new acceptance, by the World Health Organization and the U.S. Centers for Disease Control and Prevention, comes with concrete implications: Scientists<\/p>\n","protected":false},"author":1,"featured_media":19567,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-19566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-1"],"jetpack_publicize_connections":[],"_links":{"self":[{"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/posts\/19566","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/comments?post=19566"}],"version-history":[{"count":4,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/posts\/19566\/revisions"}],"predecessor-version":[{"id":19571,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/posts\/19566\/revisions\/19571"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/media\/19567"}],"wp:attachment":[{"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/media?parent=19566"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/categories?post=19566"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bestinsurance.gr\/a1\/wp-json\/wp\/v2\/tags?post=19566"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}