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Deux hommes ont contribue a la decouverte du premier virus, le virus de la mosaique du tabac. Ivanovski demontre en 1892 qu'un extrait de feuille malade reste infectieux apres filtration a travers un filtre de Chamberland. Les bacteries sont retenues par ces filtres, un nouveau monde est decouvert<space>: les agents pathogenes filtrants. Mais Ivanovski n'a sans doute pas pris toute la mesure...
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