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Antimicrobial activity of new compounds was studied against several bacteria such as Staphylococcus aureus MTCC - 96 , Escherichia coli MTCC - 443 , Pseudomonas aeruginosa MTCC - 4 41 , Streptococcus pyogenes MTCC - 442 and fungi Aspergillus niger MTCC - 282 , Aspergillus clavatus MTCC - 1323 , Candida albicans MTCC - 227 using broth microdilution method .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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