. Preventive medicine and hygiene. ared; (2) they may run a somewhatmore rapid course in which the period of incubation is shortened andin- which the height of the pustular stage occurs about the sixth day(this is known as the accelerated reaction); or (3) they may run avery much shortened, milder, and rapid course. The eruption may beonly a small papule which does not develop into a vesicle and soon dis-appears; the period of incubation may be less than 24 hours. This isknown as the immediate reaction and resembles a cutaneous tuberculinreaction in many respects. These altered reactions have
. Preventive medicine and hygiene. ared; (2) they may run a somewhatmore rapid course in which the period of incubation is shortened andin- which the height of the pustular stage occurs about the sixth day(this is known as the accelerated reaction); or (3) they may run avery much shortened, milder, and rapid course. The eruption may beonly a small papule which does not develop into a vesicle and soon dis-appears; the period of incubation may be less than 24 hours. This isknown as the immediate reaction and resembles a cutaneous tuberculinreaction in many respects. These altered reactions have been studiedespecially by von Pirquet and are shown graphically in Fig. 6. The immediate reaction may be put to practical use in order to dis-tinguish smallpox from chickenpox. Thus, Tieche has shown that small-pox virus introduced into the skin of a person immunized by vaccinationwill show the typical immediate reaction; whereas the virus of chicken-pox is invariably negative. This test can be freed of all possible danger OJ O CO. [> cS IT) {§}.
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Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
