摘要：The immuno-double-diffusion (IDD) test was used to detect antibodies against the prevalent influenza A (H3N2) viruses in sera collected weekly in Madrid from 1972 to 1975. A total of over 14 000 sera were tested. The proportion of sera positive in the IDD test was found to reflect the level of recent influenza A infection of the population. 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 (482K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 79 80 81 82 83
