4933
Microbial burden , or " bioburden , " is believed to underlie delayed healing , although little is known of those clinical factors that may influence microbial load , diversity , and / or pathogenicity .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None