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enter the brain via the olfactory nerves Studies in monkeys with intranasally instilled gold ultrafine particles loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader039vdocumentsmxreader039viewer20220405145e6b6563b8346f2eab1c04behtml5thumbnails3jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imagea href=https:reader039vdocumentsmxreader039viewer20220405145e6b6563b8346f2eab1c04behtml5page4jpg target=_blank img data-url=known-since-1941-that-polio-virus-particles-can-enter-the-brain-via-the-olfactoryhtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: cchealthorg · Known since 1941 that polio virus particles can enter the brain via the olfactory nerves Studies in monkeys with intranasally instilled gold ultrafine particles loading=lazy 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particles can enter the brain via the olfactory nerves Studies in monkeys with intranasally instilled gold ultrafine particles loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader039vdocumentsmxreader039viewer20220405145e6b6563b8346f2eab1c04behtml5thumbnails14jpg width=140 height=200 adivdivdiv class=ts-pagebutton class=gotoPage data-page=15Page 15button div class=ts-imagea href=https:reader039vdocumentsmxreader039viewer20220405145e6b6563b8346f2eab1c04behtml5page15jpg target=_blank img data-url=known-since-1941-that-polio-virus-particles-can-enter-the-brain-via-the-olfactoryhtmlpage=15 data-page=15 class=ts-thumb lazyload alt=Page 15: cchealthorg · Known since 1941 that polio virus particles can enter the brain via the olfactory nerves Studies in monkeys with intranasally instilled gold ultrafine particles loading=lazy 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