Il numero di nuovi virus e batteri scoperti ogni anno è in continuo aumento, tanto che dagli anni '60 a oggi le nuove malattie infettive sono quadruplicate. Lo affermano i dati della EcoHealth Alliance, un consorzio di ricercatori, secondo cui la tendenza riguarda tutto il mondo.
Gli esperti hanno sottolineato che, solo nelle ultime due decadi, 18 nuovi virus e batteri capaci di provocare malattie nell'uomo sono stati scoperti in Europa, oltre una dozzina nel nel Nord America, 17 in Asia e 7 in Africa.
Le ragioni di questo incremento, spiegano gli specialisti, sono da assumere a vari aspetti, come per esempio i metodi sempre più sofisticati per scovarli e caratterizzarli. Il fenomeno è però causato in particolare dalle attività umane, le quali permettono che virus e batteri, prima inaccessibili, vengano in contatto con l'uomo o che i loro vettori trovino nuovi habitat.
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