BIOL 2230 BIOL 2230
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This 4 page Class Notes was uploaded by Allison Collins on Sunday April 10, 2016. The Class Notes belongs to BIOL 2230 at Middle Tennessee State University taught by Anthony L Newsome in Fall 2015. Since its upload, it has received 18 views. For similar materials see Microbiology in Biology at Middle Tennessee State University.
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Date Created: 04/10/16
4/5 Areas of the body with natural flora Skin • 2 predominant bacteria: Staphylococcus aureus and Staphylococcus epidermis • Body odor is caused by bacteria on the surface of skin • Deodorants have antibiotic compounds • MRSA – methicillin resistant staph aureus o Major human pathogen – 20% of people are carriers Nose • Hundreds of kinds of bacteria • Neisseria meningitidis – normal flora – causes meningococcal meningitis o Meningitis: inflammation of meninges (surround spinal cord) § Caused by many kinds of bacteria and fungus § Many strains § Big problem among college students and military • Introduced to new strains from around the world • Compromised immune systems – stress, no sleep Mouth • Hundreds of kinds of bacteria • Streptococcus mutans – sticks to enamel o Produces strong acid that wears holes in enamel o Ideologic agent of cavities Large intestine • Trillions of bacteria • E. coli, Proteus klebsiella, shigella – referred to as “enterics” Small intestine • Fewer bacteria than large intestine because it’s adjacent to stomach, which is acidic and has few bacteria Lower urinary and genital system • Streptococcus, Pseudomonas These flora are normally not pathogenic, but when they get somewhere they don’t belong (e.g. circulatory system, deep tissue), cause illness or death Probiotics – MO that have clinical health benefits when consumed • Good to take when on antibiotics or when drinking alcohol Diseases of the skin Antibiotic resistant forms of S. aureus: • MRSA – especially surgical wound infections • Boil/abscess o A localized region of pus surrounded by inflamed tissue § Pus: accumulation of dead phagocytes, bacteria, and fluid § Inflammation: a host response to tissue damage characterized by redness, pain, heat, swelling • Impetigo – skin infection – tissue gets dry and crusty o Newborns – S. aureus is main cause Scalded skin syndrome – skin comes off • 2 years and older – Streptococcus pyogenes – beta hemolytic strep – skin lesions • Colony in blood agar produces clear area around colony 2 • Beta hemolysis à gram stain à Streptococcus à know whether it’s beta-‐hemolytic strep Strep throat -‐ caused by viruses – potential of scarlet fever • Swab throat: see if proteins are present – if so, put in red agar and test Pseudomonas aeruginosa – normal flora • Has ability to cause disease in humans • Dermatitis – swimming and hot tubs • Resistant to disinfectants • Otitis externa – swimmer’s ear • When burn patients die it’s usually because of a secondary bacterial infection Propionibacterium acnes • Leave significant scars • Cystic acne – also severe Streptococcus pyogenes • Flesh eating bacteria • Necrotizing fasciitis • Toxic shock syndrome – normal flora responsible – S. aureus and S. pyogenes Diseases of the eye Conjunctivitis – inflammation of the mucus membrane that lines the eyelids and outer surface of the eyeball • Many different bacteria and viruses cause it Staphylococcus and Pseudomonas • Especially people with contact lenses 3 • Neonatal gonorrheal ophthalmia – if child is born and mom has Neisseria gonorrhea, when passing through birth canal has potential to pick up o Can lead to blindness – serious form of conjunctivitis o Law: give newborns antibiotics in eyes within an hour of birth o Prevent blindness and protect hospital personnel Chlamydial conjunctivitis Pinkeye (aka conjunctivitis) • Many causes – collective term 4
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