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*'''Stress''' may result in the release of lymphocytes into the circulation, especially in young horses and cats. This response is mediated by the release of adrenaline from the adrenal medulla and it should not be confused with the stress leucogram produced by the release of the glucocorticoid hormones cortisol from the adrenal cortex.
*'''Stress''' may result in the release of lymphocytes into the circulation, especially in young horses and cats. This response is mediated by the release of adrenaline from the adrenal medulla and it should not be confused with the stress leucogram produced by the release of the glucocorticoid hormones cortisol from the adrenal cortex.
*Some cases of '''chronic infection''' may be associated with lymphocytosis but reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*Some cases of '''chronic infection''' may be associated with lymphocytosis but reactive hyperplasia in associated lymph nodes may not correlate with the numbers of circulating lymphocytes.
*'''Physiological''' lymphocytosis is common in young animals of many species. In growing pigs, this may be associated with [[Mycoplasmas Species - Overview|''Mycoplasma'']] infection.
*'''Physiological''' lymphocytosis is common in young animals of many species. In growing pigs, this may be associated with [[Mycoplasmas species - Overview|''Mycoplasma'']] infection.
*In '''premature''' or '''dysmature equine neonates''', the normal neutrophil: lymphocyte ratio of approximately 2: 1 may be reversed to produce an apparent lymphocytosis. Such animals will also have an increased mean corpuscular volume (MCV) of their red blood cells.
*In '''premature''' or '''dysmature equine neonates''', the normal neutrophil: lymphocyte ratio of approximately 2: 1 may be reversed to produce an apparent lymphocytosis. Such animals will also have an increased mean corpuscular volume (MCV) of their red blood cells.
*'''Hypoadrenocorticism''' may result in lymphocytosis and/or [[Eosinophilia|eosinophilia]].
*'''Hypoadrenocorticism''' may result in lymphocytosis and/or [[Eosinophilia|eosinophilia]].
[[Category:Haematology Changes]][[Category:To Do - James]]
[[Category:Haematology Changes]][[Category:To Do - James]][[Category:To Do - Review]]