Medical Definition of O antigen
: an antigen that occurs in the body of a gram-negative bacterial cell
— called also somatic antigen
— compare h antigenLearn More About O antigen
Cite this Entry
“O antigen.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/O%20antigen. Accessed 18 Oct. 2021.
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