. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Fig. 276.—Bacillus tuberculosis: a, Source, human; b, source, bovine. Ma- ture colonies on glycerin-agar. Actual size (Swithinbank and Newman.) manner causes the rapid development of tuberculosis after birth, the disease having remained latent during fetal life, for Birch- Hirschfeld has shown that fragments of a fetus, itself showing no tuberculous lesions, but coming from a tuberculous woman, caused fatal tuberculosis in guinea-pigs into which they wer
. A text-book upon the pathogenic Bacteria and Protozoa for students of medicine and physicians. Bacteriology; Pathogenic bacteria; Protozoa. Fig. 276.—Bacillus tuberculosis: a, Source, human; b, source, bovine. Ma- ture colonies on glycerin-agar. Actual size (Swithinbank and Newman.) manner causes the rapid development of tuberculosis after birth, the disease having remained latent during fetal life, for Birch- Hirschfeld has shown that fragments of a fetus, itself showing no tuberculous lesions, but coming from a tuberculous woman, caused fatal tuberculosis in guinea-pigs into which they were inoculated. The most frequent channel of infection is the respiratory tract, into which the finely pulverized pulmonary discharges of consump- tives and the dusts of infected rooms and streets enter. Fltigge, Laschtschenko, Heyman-Sticher, and Benindef found that the greatest danger of infection was from the atomized secretions, dis- charged during cough, from the tuberculous respiratory apparatus. Nearly every one discharges finely pulverized secretions during coughing and sneezing, as can easily be determined by holding a mirror before the face at the time. Even though discharged by con- sumptives, these atoms of moisture are not infectious except when there are open lesions in the lungs, etc. Experiment showed that they usually do not pass farther than meter from the patient, though occasionally they may be driven meters. A knowledge * "Hygienic Laboratory," Bulletin No. 24, Jan., 1908. f'Zeitschrift fiir Hygiene," etc., Bd. xxx, pp. 107, 125, 139, 163, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McFarland, Joseph, 1868-. Philadelphia and London, W. B. Saunders Company
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