Porphyromonas gingivalis oral infection exacerbates the development and severity of collagen-induced arthritis. - Marchesan JT; Gerow EA; Schaff R; Taut AD; Shin SY; Sugai J; Brand D; Burberry A; Jorns J; Lundy SK; Nuñez G; Fox DA; et al. (Arthritis research & therapy, 2013)