MRSA Infection Infectious Disease • MRSA (Methicillin-Resistant S. aureus): CA-MRSA (community — SSTIs) vs HA-MRSA (healthcare — bacteremia, pneumonia, device infections). Contact precautions mandatory. Vancomycin is standard treatment. Meningitis Neurologic System • Meningitis is inflammation of meninges. Bacterial meningitis (N. meningitidis, S. pneumoniae) is a medical emergency — antibiotics within 1 hour of presentation. Classic triad: fever, neck stiffness, photophobia. Pneumonia Respiratory System • Pneumonia is infection of the lung parenchyma. CAP (community-acquired), HAP (hospital-acquired), VAP (ventilator-associated). PSI/PORT or CURB-65 guides admission decisions.