Final answer:
In order to identify the bacterium in the infant's CSF culture, several diagnostic tests can be performed including acid-fast stain, lysozyme resistance, CAMP test, growth on PEA agar, H2S production, motility, and bile-esculin test.
Step-by-step explanation:
An infant's CSF culture showed beta growth on chocBlue-purple coccobacilli Cat +A. In order to further identify the bacterium, a series of diagnostic tests can be performed.
Option A: Modified acid-fast stain and lysozyme resistance can help determine if the bacterium is acid-fast and resistant to lysozyme, respectively. These tests can be used to identify Mycobacterium species.
Option B: The CAMP test and growth on PEA agar can be used to identify Streptococcus species.
Option C: H2S production and motility can help identify bacteria like Salmonella and Proteus species.
Option D: Bile-esculin and motility can be used to identify bacteria like Enterococcus species.