EATON-WILLIAMS Could Humidity Help In The Flu Offensive?
According to the latest research, humidity could have a significant
part to play in the transmission and survival of the influenza
A/H1N1 in areas where large numbers of people congregate such as in
hospitals. This could have huge ramifications for the humidification
industry and regulations for the built environment.
Researchers have known since the 1940s that low humidity levels
increase the survival time of the flu virus. This, together with
airborne transmission which is also affected by low humidity has
been suggested as a factor for the seasonality of flu. The droplets
expelled from a carrier, being water based, shrink rapidly due to
evaporation in an environment that is less than 40% relative
humidity (RH) and so remain airborne for long periods.
For many, increasing the environmental control of a building in
winter would simply involve increasing the air temperature to a
comfortable level of around 22°C. However, this heating effect
without the inclusion of humidity control reduces the RH levels to
those below 25%. According to the latest research by Dr Jeffrey
Shaman at Oregon State University, absolute humidity (water in the
air) is the defining factor and can greatly reduce the viability of
flu virus and the transmission of influenza.
Even the South West Hampshire Primary Care Trust’ own Management of
Pandemic Influenza claims virus survival is “enhanced in conditions
of cold temperature and low relative humidity.”
With Dr Shaman’s findings supporting a requirement for
humidification and with so many hospital builds focusing on air
tightness maybe health estate managers should be questioning this
strategy. The extent to which moisture has a part to play in our
environments is well documented but its impact on our health poses
many questions, the answers of which could have a major impact on
our hospitals’ environments, their patients, visitors and employees.
E-mail
Eaton-Williams
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