l6o MANUAL OF BACTERIOLOGY. 



Syphilis, Mumps, 



Chicken-pox, Whooping-cough, 



Measles, Yellow fever, 



Scarlet fever, Typhus fever, 



German measles, Hydrophobia, 



Dengue. 



Rheumatic fever and Beri-beri would be placed in this 

 list by many writers. 



The causes of these diseases have been very carefully 

 sought for by ordinary bacteriological methods with inde- 

 cisive results. Some of them no doubt are due to bacteria. 

 In recent years numerous observers have described a diplo- 

 coccus or short streptococcus as the cause of rheumatic fever 

 or acute rheumatism. In the case of yellow fever Sanarelli 

 described an organism (bacillus icteroides) as its cause, but 

 his view is not upheld by most of those who have worked 

 on yellow fever. 1 The bacillus described by a number of 

 observers as having been found in cases of whooping-cough 

 may also be the cause of that disease. 2 Bacilli have also 

 been described in cases of measles on several occasions. 

 Lustgarten has described a bacillus found in the lesions of 

 syphilis which resembles tubercle and smegma bacilli. More 

 recently Joseph and Piorkowsky 3 have cultivated another 

 bacillus from cases of syphilis ; how much importance should 

 be attached to it cannot as yet be stated. It is likely that 

 for some of the diseases mentioned other procedures than 

 the usual methods of research will have to be devised in 

 order that the cause may be discovered. The protozoa may 

 play a part in the etiology of some of them. Roux believes 



1 Sanarelli, La Semainc Medicare, April 4, 1900. Reed and Carroll, 

 Journal Experimental Medicine, Vol. V. 



2 See Czaplewski, Ccniralblatt f. Baktcnologic, Bd. XXIV., 1898, p. 

 865. 



3 Ccutralb!att f. Bakteriologie, Vol. XXXI., 1902, Orig. p. 445. Ber- 

 liner klin. Wochcnschrift, 1902, Nos. 13 and 14. 



