Assessment of bacterial filtration and air permeability of face masks used by people duirng the COVID-19 pandemic
E.A. Shashina1, E.V. Belova1, O.A. Gruzdeva2, A.Y. Skopin1,3, S.V. Andreev4,5, Y.V. Zhernov1, A.V. Zhukova1, T.S. Isiutina-Fedotkova1, V.V. Makarova1, O.V. Mitrokhin1
1I.M. Sechenov First Moscow State Medical University, Bldg. 2, 8 Trubetskaya Str., Moscow, 119991, Russian Federation
2Russian Medical Academy of Continuous Professional Education, Bldg. 1, 2/1 Barrikadnaya Str., Moscow, 125993, Russian Federation
3Federal Scientific Center of Hygiene named after F.F. Erisman, 2 Semashko Str., Mytishchi, Moscow region, Russian Federation
4Lomonosov Institute of Fine Chemical Technologies of Russian Technological University, 86 Vernadsky ave., Moscow, 119454, Russian Federation
5Sсiеntifiс Rеsеarсh Disinfесtology Institute, 8 Nauchnyi proezd, Moscow, 117246, Russian Federation
The pandemic caused by SARS-CoV-2 remains a serious threat to human health. Non-specific protection measures including face masks are an effective way to reduce risks of the infection spread. Face masks have different protective capacities and their effectiveness depends on an extent to which a material a mask is made of can retain droplets and aerosol particles containing the virus. Bacterial filtration can be used an as indicator showing how effectively a mask protects from contagion and air permeability can be used to estimate how comfortable it is to wear it.
Our research aim was to comparatively assess effectiveness and comfort in wearing provided by masks which were most frequently used by people during the pandemic.
We examined medical, cotton, and neoprene masks. Bacterial filtration was determined in accordance with the procedure stipulated in the State Standard GOST 12.4.136-84. Air permeability was estimated by determining how thin air was with VTPM-2 device produced by “Metroteks” LLC. All the data were statistically analyzed with StatTech v. 2.4.1 software package. We calculated quantitative indicators (M ± SD, 95 % CI for normal distribution), Fischer’s test (comparison between groups as per quantitative indicators) and Spearman’s rank correlation coefficient (directions and intensity of correlations). We developed our predictive model using linear regression.
The research results indicate that the neoprene mask tends to have the highest bacterial filtration; the cotton mask, the highest air permeability. We detected a correlation between bacterial filtration and air permeability.
All masks are quite comparable to a medical one as per all their combined examined characteristics and can be used as a barrier for mitigating risks of droplet infections spread. It is advisable to further investigate face masks with concentrating on more characteristics of their effectiveness, comfort in wearing and safety.
- Coronavirus disease (COVID-19) Weekly Epidemiological update and weekly operational update. World health organization, 2021. Available at: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/situatio... (09.11.2021).
- Сlapham H.E., Cook A.R. Face masks help control transmission of COVID-19. Lancet Digit. Health, 2021, vol. 3, no. 3, pp. e136–e137. DOI: 10.1016/S2589-7500(21)00003-0
- Chu D.K., Akl E.A., Duda S., Solo K., Yaacoub S., Schünemann H.J. COVID-19 Systematic Urgent Review Group Effort (SURGE) study authors. Physical distancing, face masks, and eye protection to prevent person-to-person transmission of SARS-CoV-2 and COVID-19: a systematic review and meta-analysis. Lancet, 2020, vol. 395, no. 10242, pp. 1973–1987. DOI: 10.1016/S0140-6736(20)31142-9
- Talic S., Shah S., Wild H., Gasevic D., Maharaj A., Ademi Z., Li X.,. Xu W. [et al.]. Effectiveness of public health measures in reducing the incidence of COVID-19, SARS-CoV-2 transmission, and COVID-19 mortality: systematic review and meta-analysis. BMJ, 2021, vol. 375, pp. e068302. DOI: 10.1136/bmj-2021-068302
- Howard J., Huang A., Lid Z., Tufekci Z., Zdimal V., van der Westhuizen H.-M., von Delft A., Price A. [et al.]. An evidence review of face masks against COVID-19. Proc. Natl Acad. Sci. USA, 2021, vol. 118, no. 4, pp. e2014564118. DOI: 10.1073/pnas.2014564118
- Reshetnikov V., Mitrokhin O., Shepetovskaya N., Belova E., Jakovljevic M. Organizational measures aiming to combat COVID-19 in the Russian Federation: the first experience. Expert Rev. Pharmacoec. Outcomes Res., 2020, vol. 20, no. 6, pp. 571–576. DOI: 10.1080/14737167.2020.1823221
- Tellier R., Li Y., Cowling B.J., Tang W.J. Recognition of aerosol transmission of infectious agents: a commentary. BMC Infect. Dis., 2019, vol. 19, no. 1, pp. 101. DOI: 10.1186/s12879-019-3707-y
- Stadnytskyi V., Bax C.E., Bax A., Anfinrud P. The airborne lifetime of small speech droplets and their potential importance in SARS-CoV-2 transmission. Proc. Natl Acad. Sci. USA, 2020, vol. 117, no. 22, pp. 11875–11877. DOI: 10.1073/pnas.2006874117
- Prather K.A., Wang C.C., Schooley R.T. Reducing transmission of SARS-CoV-2: Masks and testing are necessary to combat asymptomatic spread in aerosols and droplets. Science, 2020, vol. 368, no. 6498, pp. 1422–1424. DOI: 10.1126/science.abc6197
- Schilling K., Gentner D.R., Wilen L., Medina A., Buehler C., Perez-Lorenzo L.J., Pollitt K.J.G., Bergemann R. [et al.]. An accessible method for screening aerosol filtration identifies poor-performing commercial masks and respirators. J. Expo. Sci. Environ. Epidemiol., 2020, vol. 31, no. 6, pp. 943–952. DOI: 10.1038/s41370-020-0258-7
- Kähler C.J., Hain R. Fundamental protective mechanisms of face masks against droplet infections. J. Aerosol Sci., 2020, vol. 148, pp. 105617. DOI: 10.1016/j.jaerosci.2020.105617
- Parlin A.F., Stratton S.M., Culley T.M., Guerra P.A. A laboratory-based study examining the properties of silk fabric to evaluate its potential as a protective barrier for personal protective equipment and as a functional material for face coverings during the COVID-19 pandemic. PLoS One, 2020, vol. 15, no. 9, pp. e0239531. DOI: 10.1371/journal.pone.0239531
- Aydin O., Emon B., Cheng S., Hong L., Chamorro L.P., Saif M.T.A. Performance of fabrics for home-made masks against the spread of COVID-19 through droplets: A quantitative mechanistic study. Extreme Mech. Lett., 2020, vol. 40, pp. 100924. DOI: 10.1016/j.eml.2020.100924
- Xi J., Si X.A., Nagarajan R. Effects of mask-wearing on the inhalability and deposition of airborne SARS-CoV-2 aerosols in human upper airway. Phys. Fluids, 1994, 2020, vol. 32, no. 12, pp. 123312. DOI: 10.1063/5.0034580
- Shashina E.A., Isiutina-Fedotkova T.S., Makarova V.V., Gruzdeva O.A., Mitrokhin O.V. Approaches to analyzing efficiency of respiratory protective equipment as a way to reduce health risks during COVID-19 pandemic. Health Risk Analysis, 2021, no. 1, pp. 151–158. DOI: 10.21668/health.risk/2021.1.16.eng
- Clapp P.W., Sickbert-Bennett E.E., Samet J.M., Berntsen J., Zeman K.L., Anderson D.J., Weber D.J., Bennett W.D. US Centers for Disease Control and Prevention Epicenters Program. Evaluation of Cloth Masks and Modified Procedure Masks as Personal Protective Equipment for the Public during the COVID-19 Pandemic. JAMA Intern. Med., 2021, vol. 181, no. 4, pp. 463–469. DOI: 10.1001/jamainternmed.2020.8168
- Zhao M., Liao L., Xiao W., Yu X., Wang H., Wang Q., Lin Y.L., Kilinc-Balci F.S. [et al.]. Household Materials Selection for Homemade Cloth Face Coverings and Their Filtration Efficiency Enhancement with Triboelectric Charging. Nano Lett., 2020, vol. 20, no. 7, pp. 5544–5552. DOI: 10.1021/acs.nanolett.0c02211
- Ngonghala C.N., Iboi E., Eikenberry S., Scotch M., MacIntyre C.R., Bonds M.H., Gumel A.B. Mathematical assessment of the impact of non-pharmaceutical interventions on curtailing the 2019 novel Coronavirus. Math. Biosci., 2020, vol. 325, pp. 108364. DOI: 10.1016/j.mbs.2020.108364
- Kim M.N. What Type of Face Mask Is Appropriate for Everyone-Mask-Wearing Policy amidst COVID-19 Pandemic? J. Korean Med. Sci., 2020, vol. 35, no. 20, pp. e186. DOI: 10.3346/jkms.2020.35.e186
- Morais F.G., Sakano V.K., de Lima L.N., Franco M.A., Reis D.C., Zanchetta L.M., Jorge F., Landulfo E. [et al.]. Filtration efficiency of a large set of COVID-19 face masks commonly used in Brazil. Aerosol Science and Technology, 2021, vol. 55, no. 9, pp. 1–15. DOI: 10.1080/02786826.2021.1915466