you can red this paper may help you, you well find this articles in Pubmed
J Food Prot. 1999 Jan;62(1):77-80.
Use of modified Lactobacillus selective medium and Bifidobacterium iodoacetate medium for differential enumeration of Lactobacillus acidophilus and Bifidobacterium spp. in powdered nutritional products.
Ingham SC.
Source
University of Wisconsin-Madison, Department of Food Science, 53706-1565, USA. [email protected]
I think NRCLA or Neutral Red Chalk Lactose Agar medium is the best for cultivating and counting these organisms as a red zone is given surrounding these organisms on this medium.