lymphocytosis

https://doi.org/10.1351/goldbook.13410
Condition characterized by an abnormal increase in the number of lymphocytes in blood, usually a result of infection or inflammation.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1206 [Terms] [Paper]