The prominent lymphocytosis in whooping cough is due to:

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The prominent lymphocytosis seen in whooping cough is due to the redistribution of lymphocytes from the lymphatics into the peripheral circulation. This is because the coughing episodes associated with the infection create a negative pressure that draws lymph into the thorax, reducing the numbers of lymphocytes and other immune cells in the circulation. This temporary lymphocytosis is typically observed during the paroxysmal stage of the illness.

The Prominent Lymphocytosis in Whooping Cough Is Due To