Figure 1. The amino acid sequence of the HA1 region of the hemagglutinin of the Peru isolates and A/Beijing/262/95 compared with the 2000/01 and 2001/02 vaccine strain, A/New Caledonia/20/99. Amino acid numbering corresponds to H3 subtype (19), with additional amino acids residues present in the H1 subtype sequence indicated by an asterisk. Residue substitutions are show. A dot (.) indicates amino acid homology to A/New Caledonia/20/99.
The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.