The unknown bacterium n.19 was the Staphylococcus aureus. The hypothesis was accepted because the Staphylococcus aureus was one of the two bacteria mentioned in the introduction that can have beta hemolysis. The results concurred with the information gathered in the introduction. S. aureus is a spherical gram-positive bacterium and grows in pairs, short chain or clusters. It is a facultative anaerobe and opportunistic pathogen. Furthermore, it does not have flagella, so it is immobile. In the healthy person, S. aureus usually causes only localized skin infections. In immunocompromised patients, S. aureus can cause
