103 
a . 
> 
3“ r!3 
GO 
itwm 
umrmm 
ip\ 
q So 
if 
m g 
. o_ 
q 
dairy and the 
incubation pe- 
riod of those 
last infected 
had elapsed. 
Explosive out- 
break limited to 
customers of 1 
dairy and ces- 
sation of out- 
break 7 days 
after isolation 
of suspected 
cause. 
Explosive out- 
break limited 
to users of milk 
from 1 farm and 
occurring where 
ever this milk 
was sold. Ces- 
sation cf out- 
break when this 
milk was steril- 
outbreak when 
ste r i ) i z a t i o n 
of milk was 
stopped and 
again its reces- 
sion when milk 
was sterilized. 
Source of infec- 
tion traced to 
infected dairy; 
outbreak ceased 
when proper 
precautions 
were taken. 
y in 
ilked 
i 
•*^"3 . 
c a « 
® 03-2 
® » 
si 
|s5 
