SPECIAL BACTERIOLOGY 
121 
gical cleanliness is the only efficient means. The nurse 
should carefully destroy the soiled dressings by burning 
and disinfect her hands by washing them in 70 per cent 
alcohol or 1:1000 bichloride of mercury. The room may 
be fumigated. 
VI. Infection and Immunity 
Staphylococci produce endotoxins, and in addition to 
this, hemolysin, which destroys the red blood cells, and 
Fig. 23.—Staphylococcus pyogenes aureus. Colony two days’ old, seen 
upon an agar-agar plate, x 40 (Heim). (From McFarland —Pathogenic Bac¬ 
teria and Protozoa.) 
leucocidin which destroys the white blood cells (leuco¬ 
cytes). 
During the infection agglutinins are produced, bac- 
teriolysins, and opsonins. Phagocytosis is important in 
staphylococcus infections. 
VII. The Varieties of Staphylococci 
(a) Staphylococcus pyogenes (pus-producing) aureus 
(yellow) produces yellow pigment. 
