Summary. We describe a case of symptomatic parvovirus B19 infection transmitted by bone marrow (BM). The infection caused prolonged anaemia, thrombocytopenia, arthralgia and erythema infectiosum in a 16-year-old girl with acute myeloid leukaemia receiving a BM transplant (BMT). The BM donor was a 19-year-old asymptomatic brother who had parvovirus B19 viraemia at the time of BM harvest. Sequencing of the VP2 gene from the patient and the donor showed a perfect match of DNA sequences, confirming the mode of transmission. Parvovirus B19 represents a potential complicating factor in patients undergoing BMT, but screening by polymerase chain reaction (PCR) of donor BM may reduce the risk of infection.Keywords: bone marrow, ELISA, parvovirus B19, polymerase chain reaction, transplantation.Parvovirus B19 exhibits a marked tropism to human bone marrow (BM) and replicates only in erythroid progenitor cells (Brown & Young, 1995). The virus is transmissible by the respiratory route or by blood and infection may lead to erythema infectiosum, arthropathy, hydrops fetalis and various haematological disorders (aplastic crisis, chronic anaemia, idiopathic thrombocytopenic purpura). We present the first case of symptomatic parvovirus B19 infection transmitted by BM causing prolonged anaemia, thrombocytopenia, arthralgia and erythema infectiosum.
PATIENT AND METHODSA 16-year-old girl diagnosed with acute myeloid leukaemia underwent bone marrow transplantation (BMT) on 25 October 1984 (day 0). Twelve days later, she developed fever and a rash involving the upper extremities. The rash subsequently progressed, involving the lower extremities, neck and face (slapped cheek appearance). Coinciding with these findings, the patient complained of arthralgia, mainly involving the large joints. The symptoms gradually disappeared over a 3-week period.Examination of BM slides (air-dried BM inoculum) using light microscopy revealed no lantern cells or giant pronormoblasts at the time of BMT or during follow-up. Apart from red cell hypoplasia, no specific changes were noted. Reticulocytes were absent for extended periods of time (days 0±15 and 35±75) and reoccurred briefly in small numbers (days 16±34), before showing a slow but steady increase towards normal levels (day 76 onwards). Within the first 76 d, haemoglobin levels were accordingly low (5´6±11´6 g/dl), and a reduced number of platelets (5± 78 Â 10 9 /l) were observed. Transfusion of 16 units of red blood cells and 101 units of platelets were needed to sustain and correct these parameters. The patient then finished the standard protocol involving methotrexate and cyclosporin treatment and has had no adverse haematological symptoms during 15 years of follow-up.As part of a retrospective pilot study of parvovirus B19 infection in BM recipients, we tested a number of stored BM and serum samples from the patient by enzyme-linked immunosorbent assay (ELISA) and amplified the NS and VP genes by nested polymerase chain reaction (PCR) (Hornsleth et al, 1994). Examination of this material reve...