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Related Experiment Videos

Infectivity of secondary dapsone-resistant cases.

K Jesudasan1, V Pannikar, M Christian

  • 1Epidemiology and Leprosy Control Branch, Schieffelin Leprosy Research and Training Centre, Karigiri, Tamil Nadu, India.

International Journal of Leprosy and Other Mycobacterial Diseases : Official Organ of the International Leprosy Association
|September 1, 1988
PubMed
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Leprosy incidence among contacts of dapsone-resistant cases is similar to contacts of lepromatous leprosy. Primary dapsone resistance was detected in multibacillary leprosy cases, warranting further investigation into transmission dynamics.

Area of Science:

  • Infectious Diseases
  • Microbiology
  • Public Health

Background:

  • Dapsone remains a cornerstone of leprosy treatment.
  • Secondary dapsone resistance poses a significant challenge to leprosy control.
  • Understanding transmission patterns of drug-resistant leprosy is crucial.

Purpose of the Study:

  • To determine the incidence of leprosy among household contacts of individuals with secondary dapsone resistance.
  • To assess the prevalence of primary dapsone resistance in contacts who developed leprosy.
  • To evaluate dapsone resistance in paucibacillary leprosy cases treated with monotherapy.

Main Methods:

  • Study involved 517 household contacts of 113 leprosy cases with secondary dapsone resistance.
  • Calculated leprosy incidence rate per 1000 person years at risk.

Related Experiment Videos

  • Assessed dapsone resistance in contacts who developed multibacillary and paucibacillary leprosy.
  • Main Results:

    • Leprosy incidence rate was 4.3 per 1000 person years at risk, comparable to contacts of lepromatous cases (4.8).
    • Two to three cases of primary dapsone resistance were identified among 27 contacts with multibacillary leprosy.
    • No dapsone resistance was found in 48 paucibacillary leprosy cases treated with dapsone monotherapy.

    Conclusions:

    • Secondary dapsone-resistant leprosy cases may pose a similar transmission risk as lepromatous leprosy.
    • Primary dapsone resistance can emerge in contacts, particularly in multibacillary forms.
    • Further research is needed to investigate the potential increase in primary dapsone resistance due to secondary resistant cases.