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introduction pathogenesis clinical features eye worm lymphatic filariasis river blindness onchocerca volvulus wuchereria bancrofti diagnosis control western blot northern blot southern blot principle laboratory diagnosis of microbiology principle laboratory diagnosis diagnosis of microbiology quality control quality assurance microbiology crispr history laboratory molecular genetic separation of protein separation of rna separation of dna genetic molecular why crispr crispr and hiv crispr principle hepatitis a hepatitis e sign and symptoms cutaneous larva migrans visceral larva migrans ocular larva migrans loa-loa history epidemiology morphology life cycle. loa-loa wuchereria bancrofti