[Parvovirus B19 (PV-B19) and the human diseases it causes].

The author reviews the discovery of parvovirus B19, its characteristics, epidemiology, clinical and hematological features of acute and chronic forms of the infection in children and adults, diagnostic techniques, treatment of most severe forms.

[Reversibility of the development of malignant lymphoma with 7-years of leukemization, associated with the development of chronic myeloleukemia].

A case of typical Ph-positive chronic myelogenous leukemia developed in a 58-year old female with a 7-year history of chronic lymphoproliferative disease is described. With the second disease progression, the features of lymphoid proliferation disappeared almost completely. Possible causes of this rare combination of two diseases are discussed.