162 



larval to adult stages, can "be infected with plague by 

 feeding on infected animals. These authors also state 

 that ""by the direct "bites the plague infected adults may 

 cause an infection and death in healthy animals." Sassu- 

 chin and Tichomirova (1936) have reported studies on the 

 survival of plague "bacilli in the larvae and nymphae of 

 Dermacentor silvarum . Over 60 per cent of "both nympahe 

 and larvae died during the experiments, suggesting that 

 Pasteurella pestis was pathogenic to them. 



For a "bacteriologic description of Pasteurella pestis 

 see Bergey's Manual (5th ed. , page 29 4). 



Borzenkov, A. , Donskov, G-. 1933 The experimental infec- 

 tion of the tick Hyalomma volgense P. Schulze et E. 

 Schlottke, 1929> with plage. Rev. Microbiol. Epidermiol. 

 et Parasitol. , 12, 30. 



Eskey, C. R. 1938 Fleas as vectors of plague. Am. J. 

 Publ. Health, 28, 1305-1310. 



Eskey, C. R. , and Haas, V. H. 19^0 Plague in the western 

 part of the United States. U. S. Public Health Bui. No. 

 25^, 83 pp. 



Faddeeva, T. 1932 The role of ticks in the transmission 

 and preservation of plague virus. Rev. Microbiol. 

 Epidemiol, et Parasitol., 12, 279- 



*Kitasato, S. 189^ Preliminary note on the "bacillus 

 bubonic plague. Lancet, 2, ^28. 



Lien-teh, W. , Chun, J. ¥. , Pollitzer, R. , and Wu, C. Y. 

 I936 Plague. A manual for medical and public health, 

 workers. 5^7 PP' The Mercury Press, Shanghai. 



Ogata, M. 1897 Ueber der Pestepidemie in Formosa. Zbl. 

 Bakt. , 21, 7^- 



Sassuchin, D. , and Tichomirova, M. 193^ De la conserva- 

 tion des Pasteurella pestis dans les larves et les 

 nymphes des tiques Dermacentor silvarum Olen. Rev. 

 Microbiol., Peidemiol. et Parasitol. , 15, 3^2. 



Simond, P. L. 1898 La propagation de la peste. Ann. 

 Inst. Pasteur, 12, 625. 



*Yersin, A. 189^ La peste bubonique a Hong Kong. Ann. 

 Inst. Pasteur, 8, 662. 



Pasteurella tularens i s 

 (McCoy and Chapin) Bergey et al. 1 



Explanatory note: Considerable disagreement persists as 

 to the correct classification and naming of this bacterium. 

 Serologically it is allied to the members of the genus 

 Brucella and hence is called Brucella tularens is by Eng- 

 lish writers. However, the importance of this as a • 



