A 4 year-old girl with a history of hydrocephalus is brought to the neurologist by her parents with a severe headache and fever. The girl underwent a surgery for a ventricular-peritoneal shunt 2 months ago, and the neurologist suspects that an infection has occurred. Organisms would most likely be isolated from the shunt tubing is:
Staphylococcus epidermidis
Staph aureus
Streptococcus
Staphylococcus epidermidis
Meningococcus