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''F. nucleatum'' is a Gram-netagive negative 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.