In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: OBJECTIVE : To report a case of methicillin - sensitive Staphylococcus aureus ( MSSA ) bacteremia with suspected MSSA meningitis treated with high - dose daptomycin assessed with concurrent serum and cerebrospinal fluid ( CSF ) concentrations .
### Output Text:
OBJECTIVE : To report a case of <span class="chemical">methicillin</span> - sensitive Staphylococcus aureus ( MSSA ) bacteremia with suspected MSSA meningitis treated with high - dose <span class="chemical">daptomycin</span> assessed with concurrent serum and cerebrospinal fluid ( CSF ) concentrations . 