6998
Viable counts showed that the killing of ceftazidime - resistant E . cloacae DMST 21394 ( CREC ) cells by 3 mu g / ml ceftazidime was potentiated by 3 mu g / ml apigenin to low levels ( 10 ( 3 ) cfu / ml ) over 6h .
 Chemical: ceftazidime; Chemical: ceftazidime; Chemical: apigenin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ceftazidime; Chemical: ceftazidime; Chemical: apigenin