Barbara T. Downey

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About

Barbara T. Downey is a neuropathologist whose foundational work has advanced the diagnosis of progressive multifocal leukoencephalopathy (PML), a devastating demyelinating disease of the central nervous system caused by JC virus reactivation. Her key research centers on the histopathological and molecular detection of PML, particularly in immunocompromised patients. Downey’s major contributions include establishing the critical role of surgical biopsy in PML diagnosis, demonstrating that accurate identification depends on recognizing pathognomonic histological features—a challenge when only small tissue fragments are available. She further revolutionized diagnostic practice by pioneering in situ hybridization with a biotinylated JC virus DNA probe, automated on a Histomatic Code-On slide stainer, enabling sensitive, specific viral detection directly in brain tissue. Her 1991 papers, cited 17 and 14 times respectively, remain essential references for neuropathologists and infectious disease specialists. Downey’s work has directly improved diagnostic accuracy for PML, guiding timely clinical decisions and influencing subsequent research into JC virus pathogenesis. Her contributions underscore the enduring value of meticulous pathological analysis combined with molecular innovation in tackling rare but lethal neurological infections.