摘要：Since 1978, influenza A viruses with different antigenic properties have been isolated in many countries, even though little influenza activity has been recorded. In the present paper, the antigenic properties of viruses representative of isolates from each year since 1979 are compared, and the amino acid sequences of their haemagglutinins are described in detail. The reults give an indication of the extent and nature of variation in influenza A viruses during this period. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (548K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 671 672 673 674 675 676
