The reactive lymphocytosis occurs in mainly two kind of disorders;
1) Infectious mononucleosis
2) Other chronic viral illness
The people with reactive lymphocytosis may have;
5) sleep disturbances
The further investigations should be done are for;
The neutropenia occurs in;
1) drug toxicity,
2) vitamin deficiencies,
4) bone marrow disorders
Recurrent sore throat, is one of the common manifestation of the neutropenia.
Please read this excellent resource on the neutropenia;
Please feel free for your follow up questions.