| local reaction | A reaction which occurs at the point of entrance of an infecting organism or of an injection, as in the Arthus phenomenon. Synonym: local reaction. (05 Mar 2000) |
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| Loewenthal's reaction | The agglutinative reaction in relapsing fever. (05 Mar 2000) |
| Lohmann reaction | The reaction catalyzed by creatine kinase. (05 Mar 2000) |
| lymphocytic leukemoid reaction | Leukocytosis of varying degree, with adult lymphocytes and immature forms amounting to 40% (or more) of the total number of white blood cells in the circulating blood; may be observed in association with pertussis, infectious mononucleosis, gonorrhoea, chickenpox, and sarcoidosis. (05 Mar 2000) |