Figure 3. Nucleotide alignment of Alagoas CHIKV partial E1 sequences compared to CHIKV strains from several worldwide countries. Nucleotide sequences from Alagoas CHIKV samples (black circles) were compared to ECSA genotypes from different outbreaks previously reported in the world and the first CHIKV strain isolated from Tanzania in 1953. The Brazilian CHIKV sequences previously reported in the Sergipe, Bahia and Rio de Janeiro States outbreaks are marked with blank circles.