MILK-BORNE INFECTIONS 



471 



should show some specific characteristics by which they can be 

 recognized. Indeed, this is frequently true. The shape of the 



Fig. 195. Sediment irom market milk (Ernst) : a, b, c, Mastitis streptococci; 

 d, e, lactic streptococci; 1, 2, 3, 4, 5, cellular elements. 



Fig. 196. Long-chained streptococci from mastitis pus (Ernst). 



cell is usually flat, the longer axis being at right angles with the 

 axis of the chain. This ' 'picket-fence" shape is quite common in 



