{"id":625245,"date":"2026-01-18T22:59:43","date_gmt":"2026-01-18T21:59:43","guid":{"rendered":"https:\/\/cronologia-universale.it\/june-1959\/"},"modified":"2026-01-18T22:59:43","modified_gmt":"2026-01-18T21:59:43","slug":"may-1-1953","status":"publish","type":"post","link":"https:\/\/cronologia-universale.it\/en\/may-1-1953\/","title":{"rendered":"May 1, 1953"},"content":{"rendered":"<p>The polio vaccine. Jonas Salk was the discoverer of the polio vaccine. After graduating from New York University, Salk specialized in bacteriology at the University of Michigan, where he served as a researcher. In 1953, he completed the preparation of the polio vaccine, composed of viruses killed by formalin and effective with a simple injection. Just one year after its discovery, 400,000 children were vaccinated against the then-terrible disease.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The polio vaccine. Jonas Salk was the discoverer of the polio vaccine. After graduating from&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[29],"tags":[],"class_list":["post-625245","post","type-post","status-publish","format-standard","hentry","category-as-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>May 1, 1953 - Cronologia Universale<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cronologia-universale.it\/en\/may-1-1953\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"May 1, 1953 - Cronologia Universale\" \/>\n<meta property=\"og:description\" content=\"The polio vaccine. 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