I will start with Tube A which was examined under a microscope and found to be a gram-positive staphylococcus cocci. Upon receiving the tube, I looked over the results from our cocci report. I chose to streak a Sheep’s Blood Agar plate first. My thinking was if I were to observe weak beta hemolysis then I would have either Staphylococcus aureas or Streptococcus pyogenes. If the results were gamma then I would eliminate Staphylococcus aureas and Streptococcus pyogenes and narrow down my organism to Staphylococcus epidermidis, Enterococcus faecalis, or Sarcina lutea. After two days I returned to the lab to discover my organism exhibits gamma …show more content…
For my first plate I decided to use an Eosin Methylene Blue. This plate gives a variety of different results that are easy to interpret. A metallic green color indicates either Escherichia coli or Citrobacter freundii, purple can indicate Enterobacter aerogenes, and a pink color occurs when Serratia marcescens is plated on an Eosin Methylene Blue plate. Upon entering the lab, I discovered metallic green colonies on the plate. I then knew I had either Escherichia coli or Citrobacter freundii. To find out which I chose to inoculate a tryptophan broth with my