CULTURE MEDIA 



I. Culture Media. Differences in the quality of the meat 

 used in making the meat infusions has given some marked varia- 

 tions in the quantitative results. Meat extracts from younger 

 animals give higher counts than do extracts from the meat of 

 older animals. Again, the prepared extracts of the different 

 packing houses give different results and the results obtained 



Ova of the Pa.ra.sitic Worms of Man 

 NEMATODA 



DRAWN TO SCAI_C X lOOO 



metrically |>: 

 convex If 



A- Median focus BrSurfo.ce focus 



/Moditied from StilesJWlX (&ftr Stiles. 190J\ 

 UXRG Lcoss, t*X>.5 i * / 



Strongylus / 



.unfertilized / ^^\ SUbtlllS / 



Carter Loov 1005) 



B^R-Tumed 

 L over to 

 I show one 

 I Side flatten 

 Jed(oV>ginalj 



Oxyuris 



vermicularis A. B. 



., ^ 



CrvMthout outer i! NeCfttOT 



envelope (Modi%u 1*^1 /! americanus 



Embi^o 

 z in stool 

 after 12 to 48 



?7^ A0chylostonix f Adchyfostoma 

 duodena le^ Embryo/ ^xSSSS 1 ?^ 6 



4 R P D Trir-Vniriv: Loo*9o&7 m t ' leJ ' l * 0: ' ' in fresh stool LOOMIOOS" 



S t ron0vloidcs 

 ^ c ^^ u f" a stercorcdis 



( Original) xaU.n/i^ l&ttvr Loosx.iqo^ 



FIG. 22. Intestinal ova. Nematodes. (Stilt.) 



from the use of media made with manufactured meat extracts 

 differ from those obtained from the use of the laboratory made 

 meat infusions. In fact most workers are opposed to the use of 

 the manufactured meat extracts because of the fact that they are 

 mixed products and also because of the uncertainty of the amount 

 and number of the added ingredients any or all of which may 



