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===Fusobacterium nucleatum===
''F. nucleatum'' is a Gram-netagive bacteria that is commonly found in dental plaque. It is capable of fermenting glucose into ''butyric acid'', and is tolerant of up to 6% oxygen <ref>[https://microbewiki.kenyon.edu/index.php/Fusobacterium_nucleatum Fusobacterium nucleatum. MicrobeWiki. Retrieved 6/21/2015.]</ref>. It has a optimal growth temperature at 98.6°F <ref>[https://www.atcc.org/~/ps/25586.ashx ATCC. Fusobacterium nucleatum subsp. nucleatum (ATCC ® 25586™). Retrieved 6/21/2015.]</ref>. ''F. nucleatum'' is sensitive to a pH of 5.0 and lower, and temperatures above 140°F (60°C) <ref>[http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2672.2009.04250.x/full Ribeiro-Ribas, R.N., De Carvalho, M.A.R., Vieira, C.A., Apolônio, A.C.M., Magalhães, P.P., Mendes, E.N., Oliveira, J.S., Santoro, M.M. and De Macêdo Farias, L. (2009), Purification and partial characterization of a bacteriocin produced by an oral Fusobacterium nucleatum isolate. Journal of Applied Microbiology, 107: 699–705. doi: 10.1111/j.1365-2672.2009.04250.x]</ref>. Avoid contaminating wort with saliva, and this organism shouldn't be a problem.
===Other Microbes===
Other microbes that are ''butyric acid'' producers, probably won't be found in the brewhouse. These include bacteria that are commonly found in the guts of animals such as ''Butyrivibrio fibrisolvens'' <ref>[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC203391/ Cotta, M A, and R B Hespell. “Proteolytic Activity of the Ruminal Bacterium Butyrivibrio Fibrisolvens.” Applied and Environmental Microbiology 52.1 (1986): 51–58. Print.]</ref> and ''Eubacterium limosum'' <ref>[http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3372111/ Lee, Meng-Rui et al. “Clinical and Microbiological Characteristics of Bacteremia Caused by Eggerthella, Paraeggerthella, and Eubacterium Species at a University Hospital in Taiwan from 2001 to 2010.” Journal of Clinical Microbiology 50.6 (2012): 2053–2055. PMC. Web. 22 June 2015.]</ref>
===Metabolism===