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The CRISPR–Cas (clustered regularly interspaced short palindromic repeats–CRISPR-associated proteins) systems are immunity systems that are present in many bacteria and archaea. Here, Koonin and colleagues present a new classification of these systems and introduce a new nomenclature of the genes in the CRISPR–casloci that better reflects the relationships between the proteins.
Bacteraemia caused byStaphylococcus aureusinfections can lead to life-threatening metastatic infections. Thwaites and Gant propose that neutrophils form a privileged site that is poorly accessible to antibiotics and that plays an important part in transporting the bacteria to distant sites.
