@LogicalMD33 @guardianelm @justinquinnn @DrLeanaWen If this were true everyone present for any period of time in a space with virus with anything less than an excellent respirator would always get infected (at least back in 2020 w/no immunity). That didn't happen. Exposure dosage (i.e. time, concentration, and filtration) matters.
@LogicalMD33 @guardianelm @justinquinnn @DrLeanaWen 如果这是真的，那么任何人在任何时间都存在于带有病毒的空间中，而且任何东西都比优秀的呼吸器低，总是会被感染（至少在 2020 年没有免疫力）。那没有发生。暴露剂量（即时间、浓度和过滤）很重要。