Diphtheria is a bacterial (toxin-related) disease. It is an acute pharyngitis, acute naso pharyngitis or acute laryngitis with a pseudomembrane formation in the throat.

 Infectious Agent: Corynebacterium diphtheria

 Reservoir: Man

 Incubation Period: 2 to 5 days or may be longer

 Mode of Transmission:

  • By droplets spread through sneezing, coughing and close personal contact.

 Period of Communicability:

  • May last for 2 to 3 weeks
    • May be shortened in patients with antibiotic treatment
    • Diphtheria transmission is increased in schools, hospitals, households and in crowded areas.


  • Immunization of infants with 3 doses of DPT (at ages 6 weeks old, 10 weeks old and 14 weeks old).

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Source: Department of Health

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