Testing the efficacy of homemade masks: would they protect in an influenza pandemic?
OBJECTIVE
This study examined homemade masks as an alternative to commercial face masks.


METHODS
Several household materials were evaluated for the capacity to block bacterial and viral aerosols. Twenty-one healthy volunteers made their own face masks from cotton t-shirts; the masks were then tested for fit. The number of microorganisms isolated from coughs of healthy volunteers wearing their homemade mask, a surgical mask, or no mask was compared using several air-sampling techniques.


RESULTS
The median-fit factor of the homemade masks was one-half that of the surgical masks. Both masks significantly reduced the number of microorganisms expelled by volunteers, although the surgical mask was 3 times more effective in blocking transmission than the homemade mask.


CONCLUSIONS
Our findings suggest that a homemade mask should only be considered as a last resort to prevent droplet transmission from infected individuals, but it would be better than no protection.
Public Health England (HPA), Porton Down Salisbury, United Kingdom.
Anna
A
Davies
Katy-Anne
KA
Thompson
Karthika
K
Giri
George
G
Kafatos
Jimmy
J
Walker
Allan
A
Bennett
D000328:Adult; D004868:Equipment Failure; D005260:Female; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000517:prevention & control* / Q000635:transmission*; D008297:Male; D008397:Masks / Q000592:standards*; D058873:Pandemics; D011795:Surveys and Questionnaires; D055815:Young Adult