. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 138.—Tubercle bacilli, 1000 diameters. Fig. 139.—Tubercle bacilli, 1000 diameters. Dried sputum in rooms protected from abundant light has occasion-ally been found to contain virulent tubercle bacilli for as long as tenmonths. For a year at least it should be considered dangerous. TheRontgen rays have a deleterious effect on tubercle bacilli in cultures,but practically none upon those in tissues. Multiplication of Tubercle Bacilli in Nature Takes Place Only inthe Living Animal
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Fig. 138.—Tubercle bacilli, 1000 diameters. Fig. 139.—Tubercle bacilli, 1000 diameters. Dried sputum in rooms protected from abundant light has occasion-ally been found to contain virulent tubercle bacilli for as long as tenmonths. For a year at least it should be considered dangerous. TheRontgen rays have a deleterious effect on tubercle bacilli in cultures,but practically none upon those in tissues. Multiplication of Tubercle Bacilli in Nature Takes Place Only inthe Living Animal.—The tubercle bacillus is a strict parasite—that isto say, its biological characters are such that it could scarcely findnatural conditions outside of the bodies of living animals favorable forits multiplication. Under exceptional conditions, such as in freshlyexpectorated sputum, tubercle bacilli may increase for a limited time. Cultivation of the Tubercle Bacillus.—On account of their slowgrowth and the special conditions which they require, tubercle bacillicannot be grown in pu
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