MILK-BORNE INFECTIONS 



471 



should show some specific characteristics by which they can be 

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



i 



■rf- 







^' ..V 



t 





^. — • 









Fig. 195. — Sediment Irom market milk (Ernst): a, h, c, Mastitis streptococci; 

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



•*~i^ '^(^ 'sSjS'Sii 



% --Y t:- ^*\\^ 



TO ^ 





,/l 



% 



*s^ 



M 





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



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

 a.\is of the chain. This "picket-fence" shape is quite common in 



