摘要：An inverse ratio between infant mortality rates and poliomyelitis case rates has been observed rather constantly in some parts of the world. The available data from Latin America have been examined in this connexion and, there also, the ratio seems to hold moderately well. A general supposition both for Latin America and elsewhere is that in countries where the infant mortality rate falls below 75 per 1000 live births, the poliomyelitis case rate will bear watching, since although the disease may not have been much of a problem in such countries in the past, experience has shown that it may suddenly or gradually become one. 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 (1.2M), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 747 748 749 750 751 752 753 754 755 756 757 758
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