Endoscopy 2021; 53(01): 96
DOI: 10.1055/a-1293-8107
COVID-19 communication

Double-surgical-mask-with-slit and COVID-19 prevention

Sora Yasri
1   Private academic practice, Bangkok Thailand
Viroj Wiwanitkit
2   Dr DY Patil University, Pune, India
› Author Affiliations

We would like to discuss the letter from Lazaridis et al., “Double-surgical-mask-with-slit” method: reducing exposure to aerosol generation at upper gastrointestinal endoscopy during the COVID-19 pandemic” [1]. The authors noted that “Despite its snug fit, the narrow slit still allows easy passage of the endoscope and any required suction of the oral cavity, while the double mask itself (and its curtain-like slit) minimizes any ‘leakage’ of generated aerosols” [1]. The main question here is whether or not doubling or even tripling of masks can help to increase protection from aerosols containing pathogens. The material used for mask production is an important determinant regarding protection. In general, the size of the virus is extremely small and it might pass through the pores of a face mask [2]. This is an important physical limitation of mask use with regard to protection from COVID-19 [2]. The number of layers of face masks can contribute nothing to protection if the pore size of the mask at all the layers is still larger than the pathogen. The use of negative pressure rooms for patient care might be a more effective measure for controlling the spread of disease.


Competing interests

The authors declare that they have no conflict of interest.

Corresponding author

Sora Yasri, PhD
Private academic practice
Bangkok 101044
Fax: +66-3-4839493   

Publication History

Received: 24 September 2020

Accepted: 05 October 2020

Article published online:
09 November 2020

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