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| 1977 || Scientific development || American microbiologist {{w|Carl Woese}} recognizes that {{w|archaea}} have a separate line of evolutionary descent from {{w|bacteria}}.<ref name=Woese1977>{{cite journal | vauthors = Woese CR, Fox GE | title = Phylogenetic structure of the prokaryotic domain: the primary kingdoms | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 74 | issue = 11 | pages = 5088–90 | date = November 1977 | pmid = 270744 | pmc = 432104 | doi = 10.1073/pnas.74.11.5088 | bibcode = 1977PNAS...74.5088W }}</ref> ||
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| 1977 || Health officials in the {{w|United States}} discover that some germs within one family of bacteria, ''{{w|Enterobacteriaceae}}'', could produce an enzyme capable of breaking down common antibiotics.<ref>{{cite web|last1=Scutti|first1=Susan|title=Unusual forms of 'nightmare' antibiotic-resistant bacteria detected in 27 states|url=https://edition.cnn.com/2018/04/03/health/nightmare-bacteria-cdc-vital-signs/index.html|website=edition.cnn.com|accessdate=13 April 2018}}</ref> || {{w|United States}}
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