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1- A CSFculture from a newborn showed a profuse pure growth in BA of a beta hemolytic grayish white and translucent colony. No growth was observed in MAC.

The gram showed gpc in short chains. The catalase tes was negative.

Other tests performed were: PYR-negative Hippurate-positive CAMP-positive

Which is the identification of this isolate?

2- The ability of microorganisms to continue their multiplication process upon exposure to antimicrobial agents is termed resistance. The evaluation or susceptibility or resistance to a variety of antimicrobials is the basic principle of the susceptibility test. The results of this test depend upon the abilityof those antimicrobials to act upon different structures of bacterial cells.

Discuss which is the mechanism of action upon bacteria of the following group of antimicrobial families:

a. penicillins
b. aminoglucosides
c. quinolones
d. macrolides