Il vaccino sviluppato durante l'ultima epidemia di ebola, che aveva già dimostrato un'efficacia del 100% a breve termine, protegge dalla malattia almeno per due anni, secondo uno studio coordinato dall'Università di Ginevra e pubblicato dalla rivista Lancet Infectious Diseases.
La ricerca è stata condotta su 197 volontari che avevano già partecipato alla prima fase, quella per verificare la sicurezza del farmaco. A due anni dalla somministrazione del vaccino, tutti hanno mostrato alti livelli di protezione e anticorpi.
Per gli esperti si tratta di una buona notizia, perché il vaccino è destinato a regioni difficili da raggiungere, dove un richiamo sarebbe praticamente impraticabile.
La formula è ancora sperimentale, ma il gigante farmaceutico Merck dovrebbe chiedere l'autorizzazione per la commercializzazione entro la fine dell'anno.
ANSA/sf
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