Volume 68, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


We have followed a population in an area endemic for for three years after intensive treatment with diethylcarbamazine (DEC). Microfilariae were cleared from the circulation within four months in all eligible study participants (n = 60). There appeared to be a strong correlation between the maximum reduction in specific IgG4 and the number of days drug was taken under supervision (ρ = 0.41, < 0.001), indicating that high total dosage of DEC is necessary for optimal reduction of active infection. In individuals with good compliance (at least 180 mg/kg of body weight, n = 34), we observed variable IgG4 patterns. All pre-treatment IgG4+ children (9–14 years old) and 40% of the IgG4+ adult population (≥ 15 years old) showed a gradual decrease in anti-filarial IgG4; 53% of these showed complete clearance of worm burden by the end of the study. In contrast, another group of male IgG4+ adults showed IgG4 patterns that started to increase between nine months and two years after treatment, indicating either a partial efficacy of DEC that allowed recovery of resident adult worms or reinfection.


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  • Received : 19 Jul 2001
  • Accepted : 06 May 2002

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