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Effectiveness of surgical, KF94, and N95 respirator masks in blocking SARS-CoV-2: a controlled comparison in 7 patients.
Infect Dis (Lond). 2020 Nov - Dec; 52(12):908-912.ID

Abstract

BACKGROUND

Data on the filtration efficacies of various masks against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are limited. We thus evaluate the effectiveness of the surgical mask, the N95 respirator mask, and its equivalent (KF94 mask) in filtering SARS-CoV-2.

METHODS

Patients hospitalised with SARS-CoV-2 infection were instructed to cough five times each while wearing (1) no mask, (2) surgical mask, (3) KF94 mask, and (4) N95 mask. The coughs were separated by 20-second intervals, and the patients were rested for at least 5 min between each setting. SARS-CoV-2 viral loads in patient samples (i.e. nasopharyngeal swabs and saliva), petri dishes placed in front of the patients during coughing, and swabs from the outer and inner surfaces of the masks were analysed with PCR.

RESULTS

A total of 7 patients with SARS-CoV-2 infection participated in the mask test. SARS-CoV-2 was detected on the petri dishes after coughing in 3 out of 7 cases with the surgical mask or no mask. Viral particles were not found in the petri dishes after coughing while wearing the N95 mask or the KF94 mask. While viral particles were detected in both the inner and outer surfaces of the surgical masks, those were detected only in the inner surfaces of the N95 and K94 masks.

CONCLUSION

Surgical masks were less effective in filtering viral particles from coughing patients with SARS-CoV-2 infection. N95 masks and its equivalents efficiently blocked SARS-CoV-2 particles from coughing patients.

Authors+Show Affiliations

Division of Infectious Diseases, Department of Internal Medicine, Chung-Ang University Hospital, Seoul, South Korea.Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.Division of Infectious Diseases, Department of Internal Medicine, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, South Korea.Clinical Research Center, Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.Department of Architectural Engineering, Sejong University, Seoul, South Korea.Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

32845196

Citation

Kim, Min-Chul, et al. "Effectiveness of Surgical, KF94, and N95 Respirator Masks in Blocking SARS-CoV-2: a Controlled Comparison in 7 Patients." Infectious Diseases (London, England), vol. 52, no. 12, 2020, pp. 908-912.
Kim MC, Bae S, Kim JY, et al. Effectiveness of surgical, KF94, and N95 respirator masks in blocking SARS-CoV-2: a controlled comparison in 7 patients. Infect Dis (Lond). 2020;52(12):908-912.
Kim, M. C., Bae, S., Kim, J. Y., Park, S. Y., Lim, J. S., Sung, M., & Kim, S. H. (2020). Effectiveness of surgical, KF94, and N95 respirator masks in blocking SARS-CoV-2: a controlled comparison in 7 patients. Infectious Diseases (London, England), 52(12), 908-912. https://doi.org/10.1080/23744235.2020.1810858
Kim MC, et al. Effectiveness of Surgical, KF94, and N95 Respirator Masks in Blocking SARS-CoV-2: a Controlled Comparison in 7 Patients. Infect Dis (Lond). 2020 Nov - Dec;52(12):908-912. PubMed PMID: 32845196.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effectiveness of surgical, KF94, and N95 respirator masks in blocking SARS-CoV-2: a controlled comparison in 7 patients. AU - Kim,Min-Chul, AU - Bae,Seongman, AU - Kim,Ji Yeun, AU - Park,Se Yoon, AU - Lim,Joon Seo, AU - Sung,Minki, AU - Kim,Sung-Han, Y1 - 2020/08/26/ PY - 2020/8/28/pubmed PY - 2020/10/21/medline PY - 2020/8/27/entrez KW - N95 respirator KW - Surgical mask KW - coronavirus disease 2019 KW - severe acute respiratory syndrome coronavirus 2 SP - 908 EP - 912 JF - Infectious diseases (London, England) JO - Infect Dis (Lond) VL - 52 IS - 12 N2 - BACKGROUND: Data on the filtration efficacies of various masks against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are limited. We thus evaluate the effectiveness of the surgical mask, the N95 respirator mask, and its equivalent (KF94 mask) in filtering SARS-CoV-2. METHODS: Patients hospitalised with SARS-CoV-2 infection were instructed to cough five times each while wearing (1) no mask, (2) surgical mask, (3) KF94 mask, and (4) N95 mask. The coughs were separated by 20-second intervals, and the patients were rested for at least 5 min between each setting. SARS-CoV-2 viral loads in patient samples (i.e. nasopharyngeal swabs and saliva), petri dishes placed in front of the patients during coughing, and swabs from the outer and inner surfaces of the masks were analysed with PCR. RESULTS: A total of 7 patients with SARS-CoV-2 infection participated in the mask test. SARS-CoV-2 was detected on the petri dishes after coughing in 3 out of 7 cases with the surgical mask or no mask. Viral particles were not found in the petri dishes after coughing while wearing the N95 mask or the KF94 mask. While viral particles were detected in both the inner and outer surfaces of the surgical masks, those were detected only in the inner surfaces of the N95 and K94 masks. CONCLUSION: Surgical masks were less effective in filtering viral particles from coughing patients with SARS-CoV-2 infection. N95 masks and its equivalents efficiently blocked SARS-CoV-2 particles from coughing patients. SN - 2374-4243 UR - https://www.unboundmedicine.com/medline/citation/32845196/Effectiveness_of_surgical_KF94_and_N95_respirator_masks_in_blocking_SARS_CoV_2:_a_controlled_comparison_in_7_patients_ L2 - https://www.tandfonline.com/doi/abs/10.1080/23744235.2020.1810858 DB - PRIME DP - Unbound Medicine ER -