The
answer to this question is ‘possibly’. The conclusion to a study by Zhang et al, titled “Protection by Face Masks
against Influenza A(H1N1)pdm09 Virus on Trans-Pacific Passenger Aircraft, 2009”
is that “Wearing a face mask was a protective factor against influenza
infection.”
The
abstract to the study is:
“In
response to several influenza A(H1N1)pdm09 infections that developed in
passengers after they traveled on the same 2 flights from New York, New York,
USA, to Hong Kong, China, to Fuzhou, China, we assessed transmission of
influenza A(H1N1)pdm09 virus on these flights. We defined a case of infection
as onset of fever and respiratory symptoms and detection of virus by PCR in a
passenger or crew member of either flight. Illness developed only in passengers
who traveled on the New York to Hong Kong flight. We compared exposures of 9
case-passengers with those of 32 asymptomatic control-passengers. None of the 9
case-passengers, compared with 47% (15/32) of control-passengers, wore a face
mask for the entire flight (odds ratio 0, 95% CI 0–0.71). The source
case-passenger was not identified. Wearing a face mask was a protective factor
against influenza infection. We recommend a more comprehensive intervention
study to accurately estimate this effect.”
Posted by Tim Sandle
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