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ASSORTED MISCELLANEOUS BACTERIA A.  Chlamydia —these are tiny, gram-negative, coccoid bacteria. They are obligate intracellular  parasites with complicated life cycles. Reproduction must occur within the host cell and this  group also must use the host cell's ATP. They are transmitted by personal contact or aerosols. In  the lab, they must be grown in tissue cultures or other living cells.  1.  Chlamydia trachomatis —this organism causes: A serious eye infection called  trachoma, which was a common  cause of blindness before the age of  antibiotics, and still causes blindness  in undeveloped countries.  Probably the most common  sexually transmitted disease in the  United States, a nongonococcal  urethritis which affects the internal  reproductive organs of women and  frequently causes infertility. 
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Unformatted text preview: • Another STD—lymphogranuloma venereum 2. Chlamydia psittaci— causes psittacosis (parrot fever) 3. Chlamydia pneumoniae —mild form of pneumonia B . Spirochetes—coiled like a spring, flexible, and motile by axial filaments, which are located in a space between an outer sheath and the rest of the cells. They give a corkscrew-like motion. Many live in the human mouth. Many are free-living in water, but some are pathogens: 1. Treponema, including Treponema pallidum, the causative agent of syphilis 2. Borrelia —relapsing fever and Lyme disease, transmitted by ticks or lice 3. Leptospira , causative agents of leptospirosis, which can spread to humans by infected urine from animals such as dogs and rats. Cells have a hooked end....
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