116 PASTEUR AND AFTER PASTEUR 



after the date of inoculation, cases were observed 

 both among the inoculated and the non-inoculated. 

 After the first 4 days, there was a period of nearly 

 14 months (412 days), in which 3 attacks occurred 

 among the inoculated, while among the non-inocu- 

 lated, in the same houses, cases were taking place 

 at short intervals throughout the whole of that 

 period. And from the 417th day, during the 

 remaining thirteen months of observation, cases 

 reappeared among the inoculated. 



" During the immunisation period, which occu- 

 pied 4 days, the number of deaths among the 

 inoculated was 1*39 times smaller than among the 

 non-inoculated.* During the period of immunity, 

 lasting 412 days, the number of deaths among the 

 inoculated w r as 15*79 smaller than among the non- 

 inoculated : f which is to say that of every 100 deaths 

 from cholera, which were to take place in that 

 period of 412 days, 94 could be averted by the use 

 of the vaccine. Lastly, during the third period, 

 from the 417th to the 800th day when the 

 effects of the immunisation had vanished the 

 number of deaths among the non- inoculated was 

 1*23 times smaller than among the inoculated. 



* In the 12 houses, and the ship, where cholera occurred 

 during these 4 days, there lived 123 non-protected, and 142 

 protected. The 123 had 10 cases, of whom 6 died. The 

 142 had 6 cases, of whom 5 died. 



f In the 54 houses where cholera occurred during these 

 14 months, there lived 539 non -protected, and 279 protected. 

 The 539 had 66 cases, of whom 61 died. The 279 had 

 3 cases, of whom 2 died. 



I In the 16 houses where cholera occurred during this 

 period, there lived 126 non-protected and 41 protected. 

 The 126 had 17 cases, of whom 15 died. The 41 had 

 6 cases, all of whom died. 



