C-Reactive Protein And Interleukin-6 Are Elevated In Onchocerciasis Patients After Ivermectin Treatment

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Abstract
Ivermectin treatment of onchocerciasis can induce adverse reactions. Mechanisms underlying these reactions are poorly understood but may include activation of neutrophils. This study investigated the acute-phase response in onchocerciasis patients during 2 days after ivermectin treatment. The acute-phase protein C-reactive protein (CRP) and cytokines that mediate the acute-phase response (tumor necrosis factor-a [TNFα] and interleukin-6 [IL-6]) were measured in 144 skin snip-positive onchocerciasis patients and 12 skin snip-negative controls who received one dose of ivermectin (150 ìg/kg). No elevated TNFα levels were found, but IL-6 and CRP were elevated in 25.7% and 50.7% ofthe patients, respectively, after ivermectin treatment. Most patients (89.2%) with raised IL-6 also had raised CRP. Such increases were not observed in controls and in patients were correlated with adverse reactions and microfilarial densities. These findings suggest a possible role of the acute-phase response in microfilarial destruction following ivermectin treatment.

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