Ökad incidens av neutropeni har också observerats hos patienter vars antal neutrofila granulocyter, hemoglobinkoncentrationer och vitamin B12- nivåer i serum var låga när zidovudinbehandlingen inleddes. ###>The incidence of neutropenia was also increased in those patients whose neutrophil counts, haemoglobin levels and serum vitamin B12 levels were low at the start of zidovudine therapy.