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: He received intravenous fluids , vasopressor therapy and stress dose steroids ; he was intubated and admitted to the intensive care unit .
### Output Text:
He received intravenous fluids , vasopressor therapy and stress dose <span class="chemical">steroids</span> ; he was intubated and admitted to the intensive care unit . 