An infant had high grade fever and respiratory distress at the time of presentation to the emergency room. The sample collected for blood culture was subsequently positive showing growth of ααααα - haemolytic colonies. On Gram staining these were gram positive cocci. In the screening test for identification, the suspected pathogen is likely to be susceptible to the following agent :
Infant is suffering from pneumococcal pneumonia (Gram positive α-hemolytic cocci).
Pneumococci is differentiated from other α hemolytic Gram positive cocci by its susceptibility to optochin and bile solubility.
Bacitracin
Novobiocin
Optochin
Cloxacillin