Submicroscopic Bacteria

Submicroscopic Bacteria - Submicroscopic Bacteria

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Submicroscopic Bacteria Rickettsiae. Rickettsiae  are rod-shaped and coccoid bacteria belonging to the order Rickettsiales.  These bacteria cannot be seen with the light microscope, and therefore the Gram stain is not used  for identification. However, their walls have the characteristics of Gram-negative cell walls.  Rickettsiae are obligate intracellular parasites that infect humans as well as arthropods such as ticks,  mites, and lice. They are cultivated only with great difficulty in the laboratory and generally do not  grow on cell-free media. Tissue cultures and fertilized eggs are used instead.  Rickettsiae are very important as human pathogens. Various species cause Rocky Mountain spotted  fever, epidemic typhus, endemic typhus, scrub typhus, Q fever, and ehrlichiosis. Chlamydiae. Chlamydiae  are extremely tiny bacteria, below the resolving power of the light 
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

Ask a homework question - tutors are online