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Allrecord rapid antigen: French new crown cases increase by about 50% every week, experts recommend wearing masks on public transport Overseas Network, June 23.

The culture of normal human pharyngeal isthmus should have normal oral flora without pathogenic bacteria. The bacteria in the pharynx come from the outside and are not pathogenic under normal circumstances, but they can cause diseases due to the decline of systemic or local resistance and other external factors.