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Sono 637 le specie di microbi trovate all'interno della metropolitana di New York. A evidenziarlo è uno studio realizzato nei 960 km di questa infrastruttura, utilizzata ogni giorno da più di 5 milioni di persone.
Questi microorganismi sono in prevalenza inoffensivi, sottolineano i ricercatori dell'Università di Cornell, che hanno tuttavia individuato anche batteri resistenti agli antibiotici e alcuni frammenti di agenti patogeni temibili come l'antrace e la peste bubbonica. I livelli riscontrati erano tuttavia molto deboli.
Per gli esperti non è quindi il caso di allarmarsi e di evitare i viaggi in metro. "Questi microbi sono presenti in ogni città e infrastruttura urbana", ha sottolineato il principale autore di questa relazione scientifica.
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