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| 1884 || Scientific development || German Jewish internist {{w|Arthur Nicolaier}} discovers the causal agent of {{w|tetanus}} ''{{w|Clostridium tetani}}''.<ref name="History of Virology and Bacteriology"/><ref>{{cite book|last1=Roos|first1=Karen L.|last2=Tunkel|first2=Allan R.|title=Bacterial Infections of the Central Nervous System|url=https://books.google.com.ar/books?id=GgQshXzR9scC&pg=PA263&dq=%22in+1884%22+%22nicolaier%22+%22tetanus%22&hl=en&sa=X&ved=0ahUKEwiki5rUxanZAhUFgZAKHWSOAT0Q6AEIJzAA#v=onepage&q=%22in%201884%22%20%22nicolaier%22%20%22tetanus%22&f=false}}</ref><ref>{{cite book|title=Proceedings, American Philosophical Society (vol. 114, No. 5, 1970|url=https://books.google.com.ar/books?id=qEwLAAAAIAAJ&pg=PA396&dq=%22in+1884%22+%22nicolaier%22+%22tetanus%22&hl=en&sa=X&ved=0ahUKEwiki5rUxanZAhUFgZAKHWSOAT0Q6AEILDAB#v=onepage&q=%22in%201884%22%20%22nicolaier%22%20%22tetanus%22&f=false}}</ref><ref>{{cite book|last1=Artenstein|first1=Andrew W.|title=Vaccines: A Biography|url=https://books.google.com.ar/books?id=ewdL8ilILZAC&pg=PA106&dq=%22in+1884%22+%22nicolaier%22+%22tetanus%22&hl=en&sa=X&ved=0ahUKEwiki5rUxanZAhUFgZAKHWSOAT0Q6AEIMDAC#v=onepage&q=%22in%201884%22%20%22nicolaier%22%20%22tetanus%22&f=false}}</ref> || {{w|Germany}}
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| 1884 || Scientific development || Danish bacteriologist {{w| Hans Christian Gram }} discovers a differential stain used the identification of bacteria.<ref name="History of Virology and Bacteriology"/> ||
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| 1884 || Scientific development || French microbiologist {{w|Charles Chamberland}} develops an unglazed porcelain filter that retains bacteria.<ref name="Significant Events By Years">{{cite web|title=Significant Events By Years|url=https://www.asm.org/index.php/71-membership/archives/7852-significant-events-in-microbiology-since-1861#Year1861|website=asm.org|accessdate=8 April 2018}}</ref> ||
