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An alpha-hemolytic, catalase-negative, gram-positive diplococcus was isolated from the expectorated sputum of a 79-year-old female admitted with pneumonia

The umbilicated colony was tested against optochin and provided a zone of inhibition equal to 18 mm. The organism was screened for penicillin resistance. The oxacillin disk diffusion result equaled 16 mm. The organism should A) be reported as a penicillin-resistant Streptococcus pneumoniae. B) not be reported because it is a viridans Streptococcus. C) be reported as a penicillin-susceptible Streptococcus pneumoniae. D) be retested against penicillin using an MIC method.

What is the difference between ventricular tachycardia and ventricular fibrillation?

A. Ventricular fibrillation is chaotic in appearance; ventricular tachycardia has an absence of P waves, a heart rate of 40-100 bpm, and a wide and bizarre QRS complex. B. Ventricular fibrillation is chaotic electrical activity with only fibrillatory waves; ventricular tachycardia has an absence of P waves, a heart rate less than 20 bpm, and wide and bizarre QRS complexes. C. Ventricular tachycardia has three or more PVCs and a heart rate greater than 100 bpm; ventricular fibrillation has no P wave and an early QRS complex that is wide and bizarre in appearance. D. Ventricular tachycardia has three or more PVCs and a heart rate greater than 100 bpm; ventricular fibrillation is chaotic electrical activity with only fibrillatory waves.