Propionispira paucivorans

Characteristic Pectinatus cererisiiphilus Pectinatus frisingensis Pectinatus haikarae Selenomonas lacticifex Propionispira paucivorans Propionispira raffinosivorans... 

Propionispira raffinosivorans is considered to be a potential beer spoiler owing to its ability to grow in beer at pH 5.0 but not at pH 4.6. P paucivorans was able to grow in beer at pH 6.0 bnt not at pH 5.0 and appears to be a harmless brewery contaminant (Seidel-Riifer, 1990). There is a lack of data about other beer-spoilage properties of the Propionispira species. 

---