Systematics

SYSTEMATICS
    • Domain : Bacteria
    • Phylum : Proteobacteria
    • Class : 1. Alphaproteobacteria
    • Order : 1. Rickettsiales
    • Family : 1. Rickettsiaceae
    • Family : 2. Ehrichiaceae
    • Genus : Ehrlichia
    • Genus : Anaplasma
    • Genus : Cowdria
    • Genus : Neorickettsia
    • Genus : Aegyptianella
    • Order : 2. Rhizobiales
    • Family : Bartonellaceae
    • Genus : Bartonella
    • Class : 2. Gammaproteobacteria
    • Order : Legionellales
    • Family : Coxiellaceae
    • Genus : Coxiella
    • Phylum : Firmicutes
    • Class : Mollicutes
    • Order : Mycoplasmatales
    • Family : Mycoplasmataceae
    • Genus : Haemobartonella
    • Genus : Eprythrozoon
  • They are minute obligate intra cellular parasites requiring living cells for multiplication.
  • They were formerely considered closely related to virus.
  • But based on their characters like
    • cell walls similar to those of other Gram negative bacteria.
    • divide by binary fission
    • possessing cell wall containing muramic acid
    • metabolic enzymes independanat of the host cell
    • posess both DNA and RNA
    • large enough to be seen under the light microscope
    • held back by bacterial filters
    • susceptible to antibiotics
    • They are considered true bacteria, specially adapted to obligate intra cellular parasitism.
Last modified: Monday, 4 June 2012, 5:50 AM