Figure 1.

(a) Hematoxylin and Eosin stains of peripheral blood smear showing atypical lymphocyte. The atypical lymphocyte is larger than a mature lymphocyte. The periphery of the cell is indented by surrounding cells producing a scalloped appearance. The cytoplasm is abundant and vacuolated giving a foamy appearance; (b) patient's serum showed specific antibody response against hMPV-infected FRhK-4 cell smear by indirect immunofluorescence; (c) CPE with syncytia was developed at day 5 after inoculation of patient's nasopharyngeal wash on FRhK-4 cells; and (d) no CPE was found on uninfected FRhK-4 cells.