RT Journal Article SR Electronic T1 Enumeration of Total Viable Microorganisms in an Antibiotic Raw Material Using ChemScan® Solid Phase Cytometer JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 320 OP 331 VO 54 IS 4 A1 Ramond, Benoît A1 Rolland, Xavier A1 Planchez, Cécile A1 Cornet, Philippe A1 Antoni, Clarisse A1 Drocourt, Jean-Louis YR 2000 UL http://journal.pda.org/content/54/4/320.abstract AB A preliminary study was performed for the enumeration of microorganism contamination of the macrolide antibiotic, Spiramycin®, using epifluorescence with the ChemScan® solid phase cytometer. The artificial spiking of Spiramycin powder antibiotic with pure culture of four microorganisms led to complete recovery of the tested organisms, whatever their sensitivity to the bacteriostatic activity of the drug. With the conventional plate method run in parallel, complete recovery was only obtained for Spiramycin resistant organisms. The spiked microorganisms that were sensitive to the antibiotic remained inhibited or stressed by the action of the Spiramycin and did not grow on the plate.