120 
PRINCIPLES OF BACTERIOLOGY 
On sugar media acids are formed but gas is not pro¬ 
duced. Yellow pigment is universally formed. 
IV. Destruction 
Staphylococcus is killed by heating to 58° C. for ten 
minutes; it is very resistant to low temperatures, and 
drying is well borne. 
Solution of bichloride of mercury 1:1000 destroys 
Fig. 22.—Staphylococcus, x 1100 diameters. (Park and Williams— Patho¬ 
genic Bacteria and, Protozoa.) 
them in 10 minutes; tincture of iodine is excellent for 
destroying them. 
V. Disease-Producing Properties, Mode of Infection, 
Disinfection and Prophylaxis. 
Different strains vary in virulence. Ordinarily they 
cause local suppuration—abscesses, boils, carbuncles, etc. 
They also cause osteomyelitis (inflammation of the bone 
marrow) ; if they gain entrance to circulation they may 
cause septicemia, and abscesses in various organs. Child¬ 
birth fever is fairly frequently caused by them. For dis¬ 
infection see under Destruction. As to prophylaxis, sur- 
