Titanium dioxide particles frequently present in face masks intended for general use require regulatory control

Although titanium dioxide (TiO2) is a suspected human carcinogen when inhaled, fiber-grade TiO2 (nano)particles were demonstrated in synthetic textile fibers of face masks intended for the general public. STEM-EDX analysis on sections of a variety of single use and reusable face masks visualized agglomerated near-spherical TiO2 particles in non-woven fabrics, polyester, polyamide and bi-component fibers. Median sizes …

Continue reading Titanium dioxide particles frequently present in face masks intended for general use require regulatory control

Effects of wearing FFP2 masks on SARS-CoV-2 infection rates in classrooms

Importance: Different mitigation measures are mandated in schools worldwide to control the spread of SARS-CoV-2. The efficacy of most measures, however, has not been investigated thus far. Objective: To investigate the usefulness of FFP-2 masks in classrooms to prevent the spread of SARS-CoV-2. Design: A retrospective comparative cohort study of infection rates (evaluated by PCR …

Continue reading Effects of wearing FFP2 masks on SARS-CoV-2 infection rates in classrooms

Bacterial and fungal isolation from face masks under the COVID-19 pandemic

The COVID-19 pandemic has led people to wear face masks daily in public. Although the effectiveness of face masks against viral transmission has been extensively studied, there have been few reports on potential hygiene issues due to bacteria and fungi attached to the face masks. We aimed to (1) quantify and identify the bacteria and …

Continue reading Bacterial and fungal isolation from face masks under the COVID-19 pandemic

Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children

AbstractNose and mouth covering (NMC) has been made compulsory for children in many countries during the Covid-19 pandemic. We wanted to determine the average CO2 levels in inhaled air with NMC in children between age 6 and 17. We used short term measurements under surgical masks and FFP2 masks according to European norm EN 149, …

Continue reading Carbon dioxide rises beyond acceptable safety levels in children under nose and mouth covering: Results of an experimental measurement study in healthy children

Revisiting Pediatric COVID-19 Cases in Counties With and Without School Mask Requirements—United States, July 1—October 20 2021

Background: There has been considerable debate around mask requirements in schools in the United States and other countries during the Covid-19 pandemic. To date, there have been no randomized controlled trials of mask requirements in children. All analyses of the effectiveness of school mask mandates have relied on observational studies. The Centers for Disease Control …

Continue reading Revisiting Pediatric COVID-19 Cases in Counties With and Without School Mask Requirements—United States, July 1—October 20 2021