B. pertussis is a strict human pathogen of recent evolutionary origin and is the primary etiologic agent of whooping cough. (sanger.ac.uk)
Therefore, further research on this topic needs not only to address the etiology of depression in young people, but also to search for etiologic factors with differential distributions or effects on boys and girls. (cambridge.org)
Confirmation of an association and etiologic role of XMRV in CFS is important because it could provide a useful diagnostic test and might lead to new treatment interventions. (retrovirology.biomedcentral.com)