184 



APPLIED BACTERIOLOGY FOR NURSES 



The disease is commonly transmitted by the bite of 

 the common louse; sometimes by scratching into the skin 

 the excreta from infected lice. Prevention of the disease 

 is chiefly by the prevention of lousiness. 



Fig. 66. — Oidium (Kolle and Vvassermann). 



Fig. 67.— Achorion schonleinii, section showing the hyphse (Frankel 

 and Pfeiffer). 



