Contamination and washing of cloth #masks and risk of infection among hospital health workers in Vietnam: a post hoc analysis of a randomised controlled trial

In a previous randomised controlled trial (RCT) in hospital healthcare workers (HCWs), cloth masks resulted in a higher risk of respiratory infections compared with medical masks. This was the only published RCT of cloth masks at the time of the COVID-19 pandemic.. ..Viral contamination with rhinovirus was identified on both used medical and cloth masks. Most HCW (77% of daily washing) self-washed their masks by … Continue reading Contamination and washing of cloth #masks and risk of infection among hospital health workers in Vietnam: a post hoc analysis of a randomised controlled trial

Effect of Face #Masks on Gas Exchange in Healthy Persons and Patients with #COPD

..In order to demonstrate the changes in end-tidal CO2 (ETCO2) and oxygen saturation (SpO2) before and after wearing a surgical mask, we used a convenience sample of 15 housestaff physicians without lung conditions (aged 31.1  1.9 years, 60% male) and 15 veterans with severe COPD (aged 71.6  8.7 years, FEV1 44.0  22.2%, 100% male). The patients needed to have a post-bronchodilator FEV1 … Continue reading Effect of Face #Masks on Gas Exchange in Healthy Persons and Patients with #COPD

Facial Masking for #Covid-19 — Potential for “#Variolation” as We Await a Vaccine

…SARS-CoV-2 has the protean ability to cause myriad clinical manifestations, ranging from a complete lack of symptoms to pneumonia, acute respiratory distress syndrome, and death. Recent virologic, epidemiologic, and ecologic data have led to the hypothesis that facial masking may also reduce the severity of disease among people who do become infected.3 This possibility is consistent with a long-standing theory of viral pathogenesis, which holds … Continue reading Facial Masking for #Covid-19 — Potential for “#Variolation” as We Await a Vaccine

Reduction of secondary transmission of SARS-CoV-2 in households by face mask use, disinfection and social distancing: a cohort study in Beijing, China

Transmission of COVID-19 within families and close contacts accounts for the majority of epidemic growth. Community mask wearing, hand washing and social distancing are thought to be effective but there is little evidence to inform or support community members on COVID-19 risk reduction within families.. ..The secondary attack rate in families was 23.0% (77/335). Face mask use by the primary case and family contacts before … Continue reading Reduction of secondary transmission of SARS-CoV-2 in households by face mask use, disinfection and social distancing: a cohort study in Beijing, China

Identifying airborne transmission as the dominant route for the spread of #COVID-19

Various mitigation measures have been implemented to fight the coronavirus disease 2019 (COVID-19) pandemic, including widely adopted social distancing and mandated face covering. However, assessing the effectiveness of those intervention practices hinges on the understanding of virus transmission, which remains uncertain. Here we show that airborne transmission is highly virulent and represents the dominant route to spread the disease. By analyzing the trend and mitigation … Continue reading Identifying airborne transmission as the dominant route for the spread of #COVID-19

Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks

The emergence of a pandemic affecting the respiratory system can result in a significant demand for face masks. This includes the use of cloth masks by large sections of the public, as can be seen during the current global spread of COVID-19. However, there is limited knowledge available on the performance of various commonly available fabrics used in cloth masks. Importantly, there is a need … Continue reading Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks

Effectiveness of Surgical and Cotton #Masks in Blocking SARS–CoV-2: A Controlled Comparison in 4 Patients

..Neither surgical nor cotton masks effectively filtered SARS–CoV-2 during coughs by infected patients. Prior evidence that surgical masks effectively filtered influenza virus (1) informed recommendations that patients with confirmed or suspected COVID-19 should wear face masks to prevent transmission (2). However, the size and concentrations of SARS–CoV-2 in aerosols generated during coughing are unknown. Oberg and Brousseau (3) demonstrated that surgical masks did not exhibit … Continue reading Effectiveness of Surgical and Cotton #Masks in Blocking SARS–CoV-2: A Controlled Comparison in 4 Patients

Respiratory virus shedding in exhaled breath and efficacy of face #masks

We identified seasonal human coronaviruses, influenza viruses and rhinoviruses in exhaled breath and coughs of children and adults with acute respiratory illness. Surgical face masks significantly reduced detection of influenza virus RNA in respiratory droplets and coronavirus RNA in aerosols, with a trend toward reduced detection of coronavirus RNA in respiratory droplets. Our results indicate that surgical face masks could prevent transmission of human coronaviruses … Continue reading Respiratory virus shedding in exhaled breath and efficacy of face #masks