Importation and circulation of poliovirus in Bulgaria in 2001 by Kojouharova Mira, L.F. Zuber Patrick, Gyurova Snejana, Fiore Lucia, Buttinelli Gabriele, Kunchev Angel, Vladimirova Nadejda, Korsun Neli, Filipova Radosveta, Boneva Roumiana, Gavrilin Eugene, Deshpande Jagadish M., Oblapenko George, Wassilak Steven G.

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