why absolute lymphocytosis in pertusis

In pertussis, also known as whooping cough, the body's immune system responds to the infection by increasing the production of white blood cells, including lymphocytes. This results in a condition called absolute lymphocytosis, which is characterized by an abnormally high number of lymphocytes in the bloodstream.

Lymphocytes are a type of white blood cell that play a key role in the immune response to infections. In pertussis, the lymphocytes help to target and eliminate the bacteria that cause the illness. This increase in lymphocytes can lead to absolute lymphocytosis, which is a common finding in many infectious diseases, including pertussis.

Overall, absolute lymphocytosis in pertussis is a normal immune response to the infection and is a sign that the body is actively fighting off the illness. It can be helpful in diagnosing pertussis and monitoring the progression of the infection.