The increase in the level of eosinocytes (eosinophilia) in the blood count is often associated with the body's response to various types of infections, including parasitic ones. The human roundworm is one of the parasites that can trigger an inflammatory response of the body, which can lead to an increase in the number of eosinocytes. If the son has been diagnosed with human roundworm infection and elevated eosinocytes have been found, there is a good chance that these two phenomena are related. After antiparasitic treatment, it is expected that the number of eosinocytes will begin to gradually decrease as the infection resolves. However, the rate of decline of eosinocytes can vary from person to person and depends on many factors, such as general health, age and individual characteristics of the body, etc. In case of doubt, I encourage you to consult your doctor again. It is the doctor who decides whether to treat the patient m.in based on the history of the disease and the previous response to treatment. If it is not possible to visit a stationary one, I encourage you to use teleadvice via, for example, the portal Gdziepolek.pl: https://www.gdziepolek.pl/telekonsultacja