PubMed · 10088415
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K Watanabe, Y Yoshida, N Takeda. 1999. [Bacillus cereus pneumonia].. https://pubmed.ncbi.nlm.nih.gov/10088415/
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An unidentified Gram-negative-staining, aerobic, rod-shaped, spore-forming bacterium was isolated from a sample of cerebrospinal fluid. Based on comparative analysis of 16S rRNA gene sequences and phenotypic characteristics, the novel isolate was included in the Bacillus sphaericus-like group. The isolate was closely related to Bacillus odysseyi and Bacillus silvestris, with 96.2 and 94.4 % 16S rRNA gene sequence similarity, respectively. The major fatty acid was iso-C(15 : 0) (48 %). The name Bacillus massiliensis sp. nov. is proposed for the novel isolate, with strain 4400831(T) (=CIP 108446(T)=CCUG 49529(T)) as the type strain.
We describe a 72-year-old Chinese man who developed fulminant Bacillus cereus endophthalmitis 36 h after an uneventful surgery for cataract extraction. Clinical progression of disease was extremely rapid, in spite of early vitrectomy and intravitreal injection of antibiotics. Results of Gram staining showed gram-positive bacilli, and the culture was positive for B. cereus. Endophthalmitis is rare after cataract surgery (cumulative probability within 1 year, approximately 0.08%), and cases caused by B. cereus are even less common. The prognosis and plan of treatment are discussed.
CytK is a cytotoxin isolated from a strain of Bacillus cereus cultured from cases of necrotic enteritis and the amino acid sequence of the protein suggests that it may belong to the family of beta-barrel pore-forming toxins. We show here in planar lipid bilayers the toxin is able to form pores which are weakly anion selective and exhibit an open channel probability close to one. The predicted minimum pore diameter is approximately 7 A. We also show that cytK is a potent cytotoxin against human intestinal Caco-2 epithelia. CytK, like other beta-barrel pore-forming toxins, spontaneously forms oligomers which are resistant to sodium dodecyl sulphate (SDS), but not to boiling. CytK represents a pore-forming toxin linked with human cases of necrotic enteritis.