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Presents a study on the role played by hematopoietic cells and their progenitors in human cytomegalovirus latency and reactivation. Materials and methods used; Evaluation of latent infection in defined populations of myeloid-lineage-committed progenitor cells; Results and discussion.

Six strains of human cytomegalovirus have been sequenced, including two laboratory strains (AD169 and Towne) that have been extensively passaged in fibroblasts and four clinical isolates that have been passaged to a limited extent in the laboratory (Toledo, FiX, PH, and TR). All of the sequenced viral genomes have been cloned as infectious bacterial artificial chromosomes. A total of 252 ORFs with the potential to encode proteins have been identified that are conserved in all four clinical isolates of the virus. Multiple sequence alignments revealed substantial variation in the amino acid sequences encoded by many of the conserved ORFs. [ABSTRACT FROM AUTHOR]