3d

animal ascariasis ascaris background biological biology blood bloodstream body cell closeup covered diagram disease diseases disorder drainage edema fluid giant hairy human illustration infection infestation insect insectborne intestine large limb lumbricoides malayi medical medicine microbe microbiology microscope microscopic mosquito nature neglected nematoda parasite parasitic parasitism pest red research roundworm science sick small sneaks system trichiura unhealthy worm zoology