PPT 4

• Bacteria


  Function as independent single-celled, or unicellular, organisms
• Bacterial cell


  • Can live attached to others in colonies or other such groupings
  • Each one is fully capable of carrying out all necessary life activities, such as reproduction, metabolism, and nutrient processing unlike the more specialized cells of a multicellular organism
• Coccus/Cocci


  Rounded or spherical bacteria

  
• Staphylococci


  Cocci appearing in grapelike clusters
• Staphylococcus aureus


  • A leading cause of bacteremia and infective endocarditis (IE) as well as osteoarticular, skin and soft tissue, and device-related infections
• Streptococci


  Cocci appearing in chains
• Streptococcus pyogenes


  • Causes scarlet fever, bacteremia, pneumonia
• Diplococci


  Cocci in pairs
• Diplococcus pneumoniae


  • Major cause of pneumonia in the late 19th century
• Tetrads


  Cocci arrangement in groups of four
• Gaffkya tetragena


  • Causes acute sepsis
• Bacilli


  Rod-shaped bacteria
• Streptobacilli


  Bacilli that occur in chains
• Bacillus subtilis


  • Infections attributed include bacteremia, endocarditis, pneumonia
• Coccobacilli


  Oval-shaped bacterium, short, thick, plump oval bacilli

  
• Escherichia coli


  • Common infections include bacteremia, urinary tract infection (UTI), traveler's diarrhea, pneumonia, and neonatal meningitis
• Spirillum


  Spiral-shaped bacterium, spiral whose long axis remains rigid when in motion

  
• Spirillum volutans


  • Causes dysentery
• Spirochetes


  Cork-screw shaped, spiral whose long axis bends when in motion
• Treponema pallidum


  • Causes Syphilis
• Vibrio


  Curved rods, comma shaped rods
• Vibrio cholerae


  • Causes cholera
• Bacterial Sizes