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È tra gli animali più piccoli, ma è di gran lunga il più pericoloso per l'uomo, con diverse centinaia di migliaia di vittime ogni anno. Il 20 agosto è il World Mosquito Day, giornata istituita su iniziativa soprattutto di istituzioni e Ong contro la malaria.
La data scelta per la ricorrenza commemora Sir Ronald Ross, che proprio in questo giorno del 1897 scoprì che è la zanzara femmina a trasmettere la malaria. Proprio questa malattia è la principale causata dall'insetto, e secondo l'OMS ha causato nel 2017 435'000 morti e 215 milioni di casi nel mondo, concentrati in 11 paesi, dieci in Africa più l'India. "Quale direste che sia l'animale più pericoloso sulla Terra? I serpenti? Gli squali? - sottolinea Bill Gates in un blog sul sito della sua Fondazione - La risposta è 'nessuno di questi. Sono le zanzare".
Secondo una stima dei ricercatori della Fondazione infatti le zanzare uccidono ogni anno 725'000 persone, molte di più rispetto a serpenti (50'000) e cani (25'000), che seguono in classifica.
ansa/joe.p.
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