mycoides lactamase aureus Perchlorates pyogenes Serratia thioethers Escherichia microorganism burgdorferi tetanospasmin staphylococci Streptomyces Clostridium bacterium Klet pestis arsenites faecium streptococci coli paraprotein aerobe Chloramphenicol etoposide macrolide Enterococci bacteria CWD Helicobacter Bacillus Yersinia Kle antifungal antibiotics scrapie bacterial causative Enterococcus