220 INFLAMMATION AND SUPPURATION 



occurs, whilst in gonorrhceal conjunctivitis, often of an acute 

 purulent type, the gonococcus is present (p. 261). 



Diplo -bacillus of Conjunctivitis. — This organism, discovered by 

 Morax, is a small plump bacillus, measuring 1 x 2 /*, and usually 

 occurring in pairs, or in short chains of pairs (Fig. 56). it is non- 

 motile, does not form spores, and is decolorised by Gram's method. It 

 does not grow on the ordinary gelatin and agar media, the addition 

 of blood or serum being necessary. On serum it forms small rounded 

 colonies which produce small pits of liquefaction ; hence it has been 





*r* j ».-■■'' i *■«■». 



»» ♦"<Sj -?* 



il '' t' i - > \ ■'•% *t*i3 

 . « i ,, , £j .^ 



Fig. 55. — Koch-Weeks bacillus, from a young culture on bloorl 

 agar. Stained with weak carbol-fuchsin. x 1000. 



called the bacillus lacunatus. In cultures it is distinctly pleomorphous, 

 and involution forms also occur. It is non-pathogenic to the lower 

 animals. 



Acne. — In the pus of acne lesions and also in the comedones a 

 bacillus of somewhat characteristic appearance may be found in 

 large numbers. The organism was first described by Unna and 

 afterwards cultivated by Sabouraud, and is now generally known 

 as the acne bacillus. It occurs in the form of short rods, some- 

 times swollen at one end, and measuring about 1 "5 p in length 

 and rather less than '5 ft. in thickness. It stains readily with 

 the basic aniline dyes and retains the stain in Oram's method. 

 In cultures it grows best under anaerobic conditions, for example 

 in deep tubes of 2 per cent, glucose agar, and the reaction of the 



