Download presentation
Presentation is loading. Please wait.
Published byAudrey Day Modified over 9 years ago
1
Chapter 11 Bacteria
2
Brucella abortus G-, coccobacillus Brucellosis in cattle Reproductive organs Sterility and abortions In humans – mild symptoms
3
Rickettsias G- coccobaillus Obligate intracellular parasites Transmitted by insects such as ticks
4
Obligate intracellular parasites Rickettsia rickettsii Rocky mountain spotted fever Southeastern parts of this country, transmitted by ticks Rash – palms and soles Treated during the early stages of the disease It can cause damage to the kidneys
5
Caulobacter Aquatic environments Has a stalk Attaches to algae and absorbs nutrients
6
Stalk (stem)
9
Rhizobium Roots of plants beans and peas Convert nitrogen gas to ammonium ions Ammonium ions are used by the plants to make protein. Beneficial to plants.
10
Neisseria gonorrhoeae Gonorrhea - STD Gram negative diplococci Uses fimbriae to attach itself to the mucus membrane. Painful urination, discharge of pus. Pelvic inflammatory disease – sterility Cephalosporin, doxycycilne.
11
Neisseria gonorrhoeae Ophthalmia neonatorum – eye infection of the newborn. Lead to blindness, antibiotics are placed in the eyes as prophylaxis. Neisseria meningitidis Some people are asymptomatic carriers Aerosol Meningitis, throat infection
13
Bordetella pertussis Gram negative coccobacillus Whooping cough Grows on cilia lining the trachea DTP – vaccine – pertussis Heat killed bacteria
15
Thiobacillus Chemoautotroph Gets energy from hydrogen sulfide Found in soil Gram-, rod shaped
16
Pseudomonas aeruginosa – G- rod Opportunist Water soluble pigment (blue-green) Burn and wound infections Gentamicin, polymyxin
17
Escherichia coli G- coccobacillus Normal flora of the intestinal tract Opportunist Strain O157:H7 – pathogen – cattle Bloody diarrhea
18
Salmonella typhi G- rod, typhoid fever Found in humans Carriers – gall bladder Fluoroquinilones, chloramphenicol Contaminated food or water
19
Salmonella enteritidis Salmonellosis Poultry and cattle Undercooked, contaminated food Fever, abdominal pain, diarrhea Fluid and electrolyte therapy Cooking the meat thoroughly
20
Shigella dysenteriae G- rod, shigellosis Humans Contaminated food Produces toxin Damage to the intestinal wall Fluoroquinilones
21
Opportunists Klebsiella pneumoniae – normal flora Proteus vulgaris Enterobacter Serratia marcescens – soil Endotoxin – lipid A Nosocomial infections Septic shock, pneumonia, urinary tract infections
22
Yersinia pestis G- rod, plague Fleas from rats Southwestern – squirrels, chipmunks Direct contact Proliferate in the blood stream
23
Y. pestis Buboes – swelling of lymph nodes. Bubonic plague Mortality – 50 to 75% Streptomycin and tetracycline – prophylaxis Pneumonic plague – aerosol Mortality rate 100%
25
Vibrio cholerae G-, bent rod, single flagellum Intestine, toxin Cholera Cells lining the intestine Stimulate them to release water and electrolytes Profuse and watery diarrhea Rice water stools – mucus, epithelia cells, bacteria
27
Pasteurella multocida G- rod, normal flora of dogs and cats Oral cavity Dog or cat bites Local infection, septicemia Tetracycline
28
Hemophilus influenzae G- rod, throat of carriers Opportunist, aerosol, meningitis Compromised immune system - pneumonia
29
Chromatium G- rod, lakes and ponds Photosynthesis Hydrogen sulfide + CO2 sugar and sulfur Water + CO2 sugar + O2 (plants and algae) anoxygenic
30
Bdellovibrio G- rod, bent rod, flagellum Soil Periplasmic space of E.coli Pathogenic to E.coli
32
Desulfovibrio Sediments of lakes and ponds Anaerobic respiration Sulfur – final electron acceptor
33
Myxococcus Gliding fruiting bacteria – G- Soil Vegetative cells glide over surfaces – slime trail Aggregate – fruiting body Nutrient depletion myxosopres
35
Cyanobacteria G-, carries on photosynthesis Aquatic environments Heterocysts – nitrogen to ammonium ions CO2 and water make sugar Oxygen is released
37
Chlamydia G- cocci Obligate intracellular parasite Elementary body – usually extracellular, dormant Reticulate body – intracellular, active
39
Chlamydia trachomatis Sexual contact Most common STD Urethritis doxycycline
40
Chlamydia trachomatis Common in the tropics, southwestern USA Direct contact, flies, towels Eye infection, scarring of cornea Blindness tetracycline
42
Chlamydia trachomatis Lymphogranuloma venereum - STD Tropics, Southeastern USA Grows in the lymphatic system Obstruction of lymph vessels Doxycycline
43
Chlamydia psittaci Birds – parrots, ducks, pigeons Bird droppings Opportunist Pneumonia tetracycline
44
Spirochetes Spiral shaped, axial filaments Treponema pallidum – syphilis STD, ulcer – site of inoculation – primary stage Secondary stage – bloodstream, rash on the skin & mucous membrane
45
T. pallidum Latent stage – no symptoms Tertiary syphilis – blindness, insanity, heart problems Congenital syphilis – from the mother to the fetus Stillbirths, mental retardation
46
Borrelia burgdorferi Lyme disease Transmitted by ticks from mice Rash at the bite site – bull’s eye rash, flu- like symptoms Paralysis, heart problems Arthritis
49
Leptospira interrogans Leptospirosis – hooked ends Infected or carrier dogs – urine Contaminated soil, water Nonspecific symptoms Damage to the liver and kidneys
50
Bacteroides Obligate anaerobe G- rod Normal flora – intestinal tract, oral cavity Opportunist – infects surgical wounds, puncture wounds
51
Fusobacterium G- rod, slender with pointed ends Oral cavity
53
Mycoplasma pneumoniae No cell wall Pleomorphic – irregular Different arrangements Aerosol Walking pneumonia – mild symptoms Not bedridden
56
Clostridium Gram + Obligate anaerobe Endospores Soil 3 pathogenic species
57
Clostridium tetani - tetanus Infects deep puncture wounds Endospores become vegetative cells Neurotoxin – spastic paralysis Stiffness of the muscles Lockjaw DTP vaccine – tetanus toxoid Antitoxin – antibodies Tetanus immune globulins (TIG)
58
Clostridium botulinum - botulism Improperly canned food Neurotoxin Flaccid paralysis Double vision, drooping eyelids Toxin is heat labile
59
Clostridium perfringens Gas gangrene Gangrene – death of a tissue due to the loss of blood supply Ferments carbohydrates and releases gas Toxins kill cells Bullet wounds, frost bites Amputation
61
Bacillus anthracis - anthrax Sheep, cattle – endospores are ingested from the soil – septicemia People at risk – work with animals Cutaneous anthrax – cuts and breaks in the skin. Inhalation anthrax – wool sorter’s disease Dangerous form of pneumonia Tetracycline
62
Lactobacillus G+ rod, aerotolerant Fermentation Does not use oxygen Produces lactic acid Normal flora – intestinal tract, oral cavity Used in yogurt production
63
Listeria monocytogenes Soil – contaminate dairy products such as cheese Grows in the refrigerated temperatures. Placenta – stillbirths and miscarriages. Weak immune system – meningitis.
64
Staphylococcus aureus G+ cocci, clusters, normal flora A strain – toxic shock syndrome – tampons – toxin – rash Damage to the blood vessels Nasal surgery – absorbent packing is used.
66
S. aureus A strain – food poisoning Custard, cream pie – toxin Food poisoning Heat stable Refrigerate the food product
67
Streptococcus pyogenes G+ cocci, chains normal flora in the throat of some people Aerosol – pharyngitis – strep throat Scarlet fever – lysogenized strain, phage DNA is inserted in the chromosome of the bacteria Erythrogenic toxin – pinkish red rash - skin Tongue becomes red and enlarged – strawberry tongue.
69
Corynebacterium diphtheriae G+ pleomorphic – irregular morphology Aerosol – tough grey membrane in the throat – fibrin, dead tissue, bacteria Lysogenized strain – diphtheria toxin – kills eukaryotic cells Damage to the heart and kidneys DTP vaccine – toxoid Treated with antitoxin
72
Mycobacterium tuberculosis Acid-fast, rod shaped Aerosol – dormant for years Lungs – spreads to other parts of the body Cough, weight loss - consumption Isoniazid, rifampin, ethambutol
73
Mycobacterium bovis Bovine tuberculosis Contaminated milk Infects the bones Hunchbacked deformation of the spine BCG vaccine – avirulent strain of M. bovis
74
Mycobacterium leprae Leprosy, Hansen’s disease Face, fingers, toes Nodules, deformation Nasal secretions Armadillos
76
Nocardia asteroides Acid-fast, found in soil Infects hands and feet Streptomyces Soil Most of the antibiotics Geosmin – musty odor
Similar presentations
© 2024 SlidePlayer.com Inc.
All rights reserved.