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Ch. 24
Bacterial Diseases of the Respiratory Tract
| Question | Answer |
|---|---|
| Acute pharyngitis | (strep sore throat), impetigo, necrotizing fasciitis(flesh eating bacteria of the lay press), 2 hypersensitivity reactions--post-strptococcal states--sequuelae |
| Alveoli | tiny air sacs of lungs |
| C carbohydrate | layer in cell envelope which humans produce Abs--Abs not protective--differ among various species and have diagnostic value |
| Cloaking devices | allow bacteria to hide from our immune system |
| Cold agglutinins | apparently antibodies that mycoplasma induces in pt--unusual antibodies will agglutinate rbc's when stored in cold |
| Diphtheria | caused by diphtherotoxin--inhibits 80S ribosomes of host--affects heart and nervous system--can cause death--pseudomembrane forms in pharynx of pt--causes asphyxiation |
| Diphtherotoxin | corynebacterium diphtheriae |
| Hib | capsular polysaccharide vaccine |
| Hib conjugate | induces a memory response because of the protein so that immunity becomes long-lived and the number of disease cases plummeted |
| Immune complexes | in rheumatic fever these complexes form and result in permanent kidney damage due to glomerulonephritis--often termed lumpy-bumpy glomerulonephritis |
| isoniazid | reserved for TB treatment, used widely with other ABTs including ethambutol, rifampinm and streptomycin |
| Meningitis | inflammation of meninges--organisms spread via resp. routes--invade from throat to spinal column passing through host cells--sx, stiff neck with fever and vomiting--babies and young children--tx more than one drug initiated asap--family/workers tx |
| Meningococcus | gram-negative diplococcus, in clinical setting--highly invasive--inf. med. emergency--organism identified and iv ABT immediately--spinal tap to identify--aggressive penicillin tx |
| Menomune | vaccine to treat meningococcus--available for 4 types of polysaccharide capsule--not type B--most common type--poorly immunogenic |
| MRTB | multiply resistant TB--appearing ever-increasing numbers--people often die in spite of ABTs |
| Obligate intracellular pathogens | can't produce own ATP--must acquire from host cell |
| Pertussis | caused by bordetella pertussis--whooping cough--mainly afflicts young children--whoop is powerful--subconjunctival hemorrhaging occurs--whole-cell vaccine--stopped most deaths--hypersensitivity reactions resulted in rare deaths |
| Pneumonia | condition of lungs--caused by bacteria, viruses, parasites, fungi, physical particulates(tobacco)--alveoli damaged/filled with foreign matter--can't transport O2 into bloodstream and remove carbon dioxide |
| Pneumovax | vaccine--contains 23 of most common polysaccharide types for use in the at risk population--repeating polysaccharide structure-response is T cell independent, lasts about 5 yrs. |
| PPD | purified protein derivative--mantoux/tine test--tubercular antigens injected just below skin surface--hard raised area will result in 24/48 hrs if positive--active TB dx by x-ray--organism requires about 6 wks to culture |
| Quellung test | Ab test--based on anticapsular Abs--distinguishes capsular types--30-70% of carriers of organism and serve as reservoir for spread |
| Rheumatic fever | heart valve and joint damage--occurs several weeks after aute disease immune hypersensitivity after bacteria are eliinated--cause is likely due to production of some Abs to strep pyogens--cross react with heart tissue |
| Rusty sputum | another sgn of infection due to bleeding in lungs--fluid and great numbers of phagocytes allow palpitation of infected area |
| Scarlet fever | strep pyogenes produces 2 streptolysins--damage cell membranes including heart and WBCs--some strains secrete an erythrotoxin is the cause of rash |
| Streptolysins | (SLO and SLS) damage cell membranes including those of the heart and WBCs |
| Subacute endocarditis | group A strp caused damage to heart valves via toxins(do not grow on heart tissue)--organisms attach to and grow on damaged valve tissue--further damaging valves |
| Tubercles | organisms walled off into hard foci in lung tissue--visible by x-ray |
| Tuberculosis | disease caused by M tuerculosis--TB--invasion of lung accompanied by tissue destruction--spread via resp. droplets--sx: fever, night sweats, coughing and wasting--tx with triple ABT for 6 mos. to 2 yrs. |
| Viridans strep | group of streptococci--not a genus name--organisms not usually speciated--humans carry organisms in mouths/resp tracts--no problems in normal individuals--people with heart damage, special risk-- |
Created by:
heatherlvn
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