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  • Title: Ivermectin 400 micrograms/kg: long-term suppression of microfilariae in Bancroftian filariasis.
    Author: Moulia-Pelat JP, Glaziou P, Nguyen LN, Chanteau S, Plichart R, Beylier I, Martin PM, Cartel JL.
    Journal: Trans R Soc Trop Med Hyg; 1994; 88(1):107-9. PubMed ID: 8153984.
    Abstract:
    Forty-three Wuchereria bancrofti carriers were given 4 successive semi-annual single doses of ivermectin 100 micrograms/kg (IVER 100). The geometric mean microfilaremia (mf) recurrence percentages, compared to the pre-initial treatment mf level, were 35%, 21%, 17% and 17% at 6, 12, 18 and 24 months respectively. However, the recurrence of mf 6 months after the fourth treatment remained high in 15 individuals, considered as 'bad responders'. At month 24, the subjects were randomly allocated into 2 groups: the first group was treated with a fifth dose of IVER 100 and the second with a first, single dose of 400 micrograms/kg of ivermectin (IVER 400). At month 30, the mf recurrence percentage was significantly higher in patients treated with IVER 100 than in those receiving IVER 400 (61% vs. 8%, P < 0.05). In the IVER 100 group, 6 of the 8 'bad responders' remained 'bad responders', whereas only 2 of 7 did so in the IVER 400 group. Only 3 additional patients in the IVER 100 group became consistently amicrofilaraemic, whereas 9 did so in the IVER 400 group. Two 'good responders' in the IVER 100 group became 'bad responders'. A single dose of 400 micrograms/kg of ivermectin has been demonstrated to be efficient for the treatment of carriers refractory to repeated doses of 100 micrograms/kg and to result in better long-term mf suppression. These results suggest a possible effect of 400 micrograms/kg of ivermectin on macrofilaria.
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