L'humidité de l'air combat la grippe

Un niveau d'humidité intérieure compris entre 40 et 60% HR a été scientifiquement prouvé pour lutter contre les infections grippales aéroportées. Ce niveau d'humidité idéal raccourcit le temps pendant lequel la grippe aéroportée reste infectieuse.

Les études scientifiques ci-dessous ne sont que quelques-unes des nombreuses études qui montrent à quel point l'humidité intérieure correcte est vitale pour la lutte contre les infections aériennes.

Pendant les mois froids d'hiver, lorsque les systèmes de chauffage assèchent l'air, l'humidité intérieure tombe souvent dans la zone de danger sèche de moins de 40% HR. Cela se traduit par plus de grippe et d'infections respiratoires se propageant dans l'air intérieur que nous partageons tous.

L'utilisation d'humidificateurs n'est qu'un moyen de garantir que l'humidité intérieure idéale est maintenue tout au long de l'hiver.

"40-60% d'humidité relative est l'humidité idéale de l'air intérieur. À ce taux d'humidité, le virus de la grippe aéroporté est rapidement inactivé tout en étant inférieur à celui qui favorise la croissance des moisissures. "
  Dr.med Walter Hugentobler
 

Ce que les études scientifiques nous aprennent  à ce sujet :

Noti et al 20131
Manikin experiment

Method: Manikins “coughed” flu from nebulizers into a room at different humidity levels. Air samplers collected aerosol particles to assess their continued infectious nature.

Summary result: Flu retains its infectious nature in dry air below 40%RH up to five times longer than in air above 40%RH.

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Yang et al 20122
Droplet observation

Method: Measured the survival of flu in droplets of different solutions at varying humidity levels to isolate the effects of humidity and the host droplet’s composition on flu.

Summary result: At room temperature, flu survival rate is lowest at around 50%RH, due to salt concentrations of the host droplet being most damaging to the virus at this level.

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Lowen et al 20073
Guinea pig experiment

Method: Placed caged guinea pigs infected with flu next to uninfected caged guinea pigs, in a controlled environment at different humidity levels to assess humidity’s effect on transmission.

Summary result: Flu transmission between guinea pigs was lowest at 50%RH and significantly increased as the humidity decreased.

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Etudes sur l'absentéisme : 

Sale 19724
Nursery study

Method: Winter absenteeism from respiratory infections was recorded across two nurseries without humidification (ave. 35-40%RH) and compared to one nursery with humidification (ave. 50%RH).

Summary result: Child absenteeism from respiratory infections was 7.1% in the group without humidification and 1.3% in the group with humidification.

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Gelperin 19735
Army study

Method: Incidents of respiratory infection in two groups of army recruits was monitored in two barracks; one with humidification (ave. 40%RH±5%) and one without humidification (ave. 20%RH±8%).

Summary result: Incidents of respiratory infections across two winters and 1,560 recruits was 14% lower in the humidified barracks than the non-humidified barracks.

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Green 19816
Hospital study

Method: Staff absenteeism was monitored across three hospitals during subsequent winters. Two hospitals had no humidity control (ave. 19-22%RH) and one had humidification (ave. 31-34%RH).

Summary result: The average absenteeism rate in the non-humidified hospitals was 2.5%. In the humidified hospital this was reduced to 1.87% in one year and 1.56% the following year.

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Références:

1 Noti et al, 2013, High humidity leads to loss of infectious influenza virus from simulated coughs, PLoS One. 2013; 8 (2):e57485
2 – Yang et al 2012, Relationship between Humidity and Influenza A Viability in Droplets and Implications for Influenza’s Seasonality, PLoS ONE 7(10): e46789
3 – Lowen et al, 2007, Influenza virus transmission is dependent on relative humidity and temperature, PLoS One Pathogens Okt. 2007/Vol. 3/Issue 10/e151
4 – Sale, 1972, Humidification to reduce respiratory illnesses in nursery school children, Southern Medical Journal, July 1972, Vol. 65, No 7
5 – Gelperin, 1973, Humidification and Upper Respiratory Infection Incidence, Heating, Piping and Air Conditioning, Vol. 45, No.3
6 – Green, 1981, Winter humidities and related absenteeism in Canadian hospitals, Digest of the 3rd CMBFS Canadian Clinical Engineering Conference

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