Ventilate the rooms: the gesture is simple. And yet; we neglect it too often. This is what four specialists in the circulation of viruses point out in the British medical journal BMJ.

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Opening the windows, an essential gesture in the fight against the epidemic

Since the start of the pandemic, we have become accustomed to respecting barrier gestures: wearing a mask, distancing, disinfecting hands and surfaces … But one recommendation would not be sufficiently applied: the ventilation of rooms. An essential measure to fight against the spread of the virus. “In a confined room, studies show that there is 10 times more risk of getting infected than when you are outside, explains Dr Benjamin Davido, infectious disease specialist at Raymond-Poincaré hospital (AP-HP). At the start of the pandemic, in China, an interesting case had been noted. There had been contaminations without individuals ever crossing paths, in an elevator, where there was no ventilation. The individuals had found themselves there one after the other and had become infected within the same building. ”

Particles stay in suspension for several hours

It is possible to contaminate each other without even crossing each other: when we breathe out, we emit very small particles, which can carry the virus. However, these particles can remain in suspension for several hours. It is therefore necessary to renew the air frequently to avoid contamination. “Ideally, rooms should be ventilated for 10 minutes every hour, in order to ensure sufficient ventilation. And obviously, it is not because you ventilate a room that you have to remove your mask: you have to try to keep it as much as possible ”, adds Dr Benjamin Davido.

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