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Dendrogram showing sequence relationship among Albanian isolates and data bank reference strains. The tree is based on 278 nt of the VP1-coding region. Pol1Sab, poliovirus type 1 strain Sabin; Pol1Mah, poliovirus type 1 strain Mahoney; PIPOLS2VP1, poliovirus type 2 strain Sabin; POV7966, -7, -8, -9, human poliovirus cases from Albania (10); AFP6 and -8, human poliovirus cases (this study); LanaA, -B, -C, and -D, environmental poliovirus isolated from the Lana River (this study).
