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Transmission electron micrographs of C. pneumoniae-infected human lymphocytes. The analysis of C. pneumoniae-infected human lymphocytes (A and B, time zero after infection; C and D, 3 days after infection) by electron microscopy showed the attachment of chlamydiae to the surface of a lymphocyte (A), internalization of chlamydiae in a lymphocyte (B), and many Chlamydia particles of various sizes in a cell (C and D). Arrows indicate Chlamydia particles.
