. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Grams staining is sometimes marked. Biology.—^The typhoid bacillus is a motile, aerobic, facultativeanaerobic, non-liquefying bacillus. It develops best at 37° C; above40° and below 30° growth is retarded; at 20° it is still moderate; below10° it almost ceases. It grows slightly more abundantly in the presenceof oxygen. It does not form spores. Resistance.—^When a number of typhoid bacilli are dried most ofthem die within a few hours, the remainder gradually dying duringthe next few
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . Grams staining is sometimes marked. Biology.—^The typhoid bacillus is a motile, aerobic, facultativeanaerobic, non-liquefying bacillus. It develops best at 37° C; above40° and below 30° growth is retarded; at 20° it is still moderate; below10° it almost ceases. It grows slightly more abundantly in the presenceof oxygen. It does not form spores. Resistance.—^When a number of typhoid bacilli are dried most ofthem die within a few hours, the remainder gradually dying duringthe next few weeks. A few frequently remain alive for months. Intheir resistance to heat and cold they behave like the average non-spore-bearing bacilli. With rare exceptions they are killed by heating to60° C. for one minute. CULTIVATION 335 ;,; Motility.—^Typhoid bacilli, when living under favorable conditions,\are very actively motile, the smaller ones having often an undulating motion, while the larger rods move about rapidly. In different cultures, however, the degree of motility
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