Although microscopic analysis revealed the presence of grape…

Although microscopic analysis revealed the presence of grapelike clusters of gram-positive cocci, you know that the species identification of the organism will require biochemical testing. Biochemical tests aid in microbial identification by providing information on   

 Paul McCartney (Chapman’s boyfriend) inoculates Staphylococ…

 Paul McCartney (Chapman’s boyfriend) inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?