div class=ts-pagebutton class=gotoPage data-page=1Page 1button div class=ts-imageimg data-url=is-insusceptibility-to-vaccine-produced-by-small-poxhtmlpage=1 data-page=1 class=ts-thumb lazyload alt=Page 1: Is Insusceptibility to Vaccine produced by Small-pox loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader035vdocumentsusreader035viewer20220812135750679f1a28ab0f07ac63c7html5thumbnails1jpg width=140 height=200 divp© 1899 Nature Publishing Grouppdiv