RT Journal T1 INsidious pleurisy. JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1899 FD June 24 VO XXXII IS 25 SP 1451 OP 1452 DO 10.1001/jama.1899.02450520049008 UL http://dx.doi.org/10.1001/jama.1899.02450520049008 AB Time was when it was generally believed by the medical profession that pleurisy was due to cold and exposure, and in most instances it was supposed to be produced by very similar causes to those which were thought to cause pneumonia. With the advances which have been made in our bacteriologic knowledge, we have gradually learned that pneumonia in all its forms is due to an invasion of the lung by a micro-organism and that in its most characteristic form it is due to the micrococcus lanceolatus. Even more recently than the discovery that pneumonia is due to systemic infection and is but a localized manifestation of general disease, we have learned that inflammation of the pleura is due to infection by the staphylococcus, streptococcus and bacillus of tuberculosis, and more rarely to other infecting micro-organisms.These rare forms of pleuritic infection are also very frequently insidious in their onset