Of the 24 having a non-reacting report in 1927-28, 15 were 75.00 — 

 99.99 per cent tested in 1928-29. In contrast to thio, only 2 of the 11 

 having infection in 1927-28 were in the 75.00 — 99.99 per cent tested group 

 in 1928-29. This is an unfortunate situation, for the previously reacting 

 flocks are in greater need of 100 per cent annual testing than the pre- 

 viously non-reacting flocks. As has been mentioned several times, the 

 untested birds on the premises constitute a potential source of danger. 

 This is especially evident on farms where infection has previously been 

 present. 



A vivid example of such an instance was called to our attention during 



