@EricTopol In winter (outdoor temp at 5C), 14 fold decreases, and in summer (outdoor temp at 18C) 2 fold decreases. They did not mention the place. I would check the humidity. Now our study suggests 12-13C WBT is the most infectious. Therefore it was safe with windows open in winter. 1/ 
@EricTopol However, in summer when windows were open WBT could be near to 12-14C. It will depend on humidity as well. They said something bizarre in the discussion. In winter, natural ventilation is low which is related to diffusion. But when you keep windows open you expect convection. 2/
@EricTopol Their argument about ventilation is not the right thing here. In both climates, they kept windows open and got two different outcomes. The temperature and relative humidity which has played the ultimate role here. Therefore, when you ventilate you have to be careful on this. 3/
@EricTopol If ventilation makes indoor 12-14C wet bulb temp, then you definitely will not want to do this. But if ventilation helps to get out of this virus infection temp, you should consider ventilation. Also, mask works of course! 4/
https://twitter.com/mahmudme01/status/1428356287490711556
@EricTopol This is not a combined effect. This is basically the effect of the mask.
@EricTopol It is interesting why they didn't try mask with all windows open in winter. I believe they would see the quite a high viral load. While mask keeps airway warm, however, cold air makes the airway cold. In combination, it would make the airway at virus fav temp.
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