• The Spell of Cox­iella

    by Elio — A few years ago, we cel­e­brated one of the pret­ti­est dis­cov­er­ies in mod­ern mi­cro­bi­ol­ogy, achiev­ing the growth of Cox­iella bur­netii out­side its host cells in lab­o­ra­tory me­dia. The ex­cite­ment was jus­ti­fied, as this or­gan­ism had been a pro­to­type of a strictly in­tra­cel­lu­lar or­gan­ism. Best I know, it does not nat­u­rally grow out­side of cells, de­spite hav­ing the abil­ity to do so.

  • Cox­iella In­ter­cepts Host Sig­nals!

    by S. Mar­vin Fried­man — To the con­ster­na­tion of med­ical stu­dents and oth­ers who are obliged to learn such mat­ters for ex­ams, the num­ber of spe­cial at­trib­utes that dis­tin­guish one pathogen from the oth­ers is colos­sal. But to those who are gen­uinely in­ter­ested in the world of pathogens, each as­sort­ment of dis­tin­guish­ing prop­er­ties holds its…

  • Cox­iella Es­capes from Cell!

    by Elio — Sur­prise! Cox­iella bur­netii, the agent of Q fever, has been grown in cell-free me­dia. This is news be­cause, along with rick­ettsiae and a few oth­ers, C. bur­netii is the stereo­typ­i­cal ob­lig­ate in­tra­cel­lu­lar bac­te­r­ial par­a­site. Un­til now, cox­iel­lae could only be grown within a host or in host cells in cul­ture. So how did...