![]() ![]() 16Įxisting legislation for water quality rules that if harmful micro-organisms are detected in the water drinking or bathing need to be immediately prohibited and actions need to be implemented to avoid health risk. 15Ĭonsequently, the rapid growth of knowledge of the mechanism behind the airborne transmission of COVID-19 is leading to a paradigm shift in the way we see and manage the propagation of respiratory infections. This action was recognized in March of 2021 by the World Health organization (WHO) in its document “Roadmap to improve and ensure good indoor ventilation in the context of COVID-19″. 13, 14Īs the transmission via aerosols is a major pathway for spreading SARS-CoV-2, promoting measures to reduce indoor concentrations, namely though ventilation improvement, can contribute to minimizing the risks. The current surge of the Omicron variant, with increased infectiousness, highlights the concerns over airborne transmission supported in novel outbreak reports. 11 The latter are implied as major drivers of the pandemic and are responsible for multiple secondary cases. 9, 10 These so called super-spreading events are characterized by a large number of infections caused by a single index case, and further support the aerosol transmission mode of SARS-CoV-2. ![]() ![]() 7, 8 The implications of these features for transmission are of particular importance in the case of indoor settings for human gatherings, such as restaurants or choirs for example, where events of increased spreading occur. Nevertheless, activities such as speaking, singing or coughing and sneezing will induce further aerosol formation in upper areas such as the larynx and the oral/nasal regions. Small aerosols are mainly produced in lower respiratory tract. 5, 6 Aerosol emission rate will depend on the type of the respiratory activity and loudness of speech. In fact, contrary to the belief that bio-aerosol formation exclusively results from aerosol-generating procedures, the production of infectious aerosols may occur from normal expiratory activities, such as breathing and speaking. 2, 3 In addition, unlike other infectious diseases, it has been shown that an asymptomatic individual with COVID-19 in the incubation period can transmit the virus by talking or breathing. When a person with COVID-19 breathes, coughs or sneezes, droplets and aerosols, that contain SARS-CoV2 virus, are released. we have known from the Hippocrates, “On Airs, Waters and Places”, that one of the most frequent causes of disease is the bad quality of air. ![]()
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