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Diphtheria

TASHKENT MEDICAL ACADEMY Department of infectious and pediatric infectious diseases. Diphtheria. Reader :. Diphtheria.

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Diphtheria

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  1. TASHKENT MEDICAL ACADEMY Department of infectious and pediatric infectious diseases Diphtheria Reader:

  2. Diphtheria An acute, highly contagious toxin-mediated infection, diphtheria is caused by Corynibaterium diphtheriae, a gram-positive rod that usually infects the respiratory tract, primarily involving the tonsils, nasopharynx and larynx.

  3. Diphtheria • Greek diphthera (leather hide) • Caused by Aerobic Gram positive rods • Cornyebacterium diphtheriae • Exotoxin production only if infected by virus phage infected carrying toxin gene

  4. Gram positive Bacilli and Colonies

  5. Diphtheria Epidemiology • Reservoir Human carriers Usually asymptomatic • Transmission Respiratory Skin and fomites rarely • Temporal pattern Winter and spring • Communicability Up to several weeks without antibiotics

  6. Diphtheria Epidemiology • The source of infection - patients or healthy carriers of toxigenic diphtheria bacteria. • The greatest danger is posed by an epidemic of diphtheria patients throat, nose and throat, actively secrete infective in the environment in expired air (less dangerously ill with diphtheria eyes, skin, wounds and other sites that can spread the infection by contact (through hands, utensils). • Infective ability of healthytoxigenicbacteria carriersin ten times lower than patients with damage to tissues of the respiratory tract.

  7. Pathogenesis • The entrance gate - almost all of the integument (skin and mucous membranes) of macro organism (usually oropharyngeal mucosa, much less often - the larynx, nose, conjunctival, genital, wound surface, skin, etc.) • Toxigenic Corynebacterium fixed to the tissue cells, multiply, and in the process of life produce an exotoxin.

  8. Classification of diphtheria

  9. Diphtheria Clinical Features • Incubation period 2-5 days (range, 1-10 days) • May involve any mucous membrane • Classified based on site of infection • anterior nasal • pharyngeal and tonsillar • laryngeal • cutaneous • ocular • genital

  10. Pharyngeal and Tonsillar Diphtheria • Insidious onset of exudative pharyngitis • Exudate spreads within 2-3 days and may form adherent pseudo membrane • Membrane may cause respiratory obstruction • Fever usually not high but patient appears toxic

  11. Thick Membrane

  12. Pseudo membrane

  13. ‘Bull Neck’

  14. Skin Lesions

  15. Diphtheria Complications • Mostly attributable to toxin • Severity generally related to extent of local disease • Most common complications are myocarditis and toxic neuritis with palsy • Death occurs in 5%-10% for respiratory disease

  16. Diphtheria Antitoxin (DAT) • Produced in horses • First used in the U.S. in 1891 • Used only for treatment of diphtheria • Neutralizes only unbound toxin

  17. Дозы противодифтерийной сыворотки при различных формах дифтерии (тыс. антитоксических единиц)

  18. DTaP (АКДС)

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