strongyloides stercoralis larva in stool exam

abdominal animal ascariasis background biological biology concept control diarrhea disease dog duodenum education entomopathogenic hand health healthy helminth host human infectious insect intestinal intestine invertebrate isolated levamisole lumbricoides magnification malnutrition micro microscope microscopy nature nematoda nematode pain parasite parasitic pathogen pathogenic pest roundworm sanitation science steinernema steinernematidae swelling system tapeworm washing wildlife worm zoology