Fleas are more common than parasitic worms. Water contaminated with various pathogens houses a host of parasitic and microbial infections. Esophagitis that happens due to a viral, fungal, parasitic or bacterial infection. Dysentery results from bacterial, or parasitic infections. Humans and animals are natural reservoirs for parasitic or dermatophytic fungi. Larvae and pupae are links in the diets of birds and parasitic entomophagous insects. Jellyfish are hosts to a wide variety of parasitic organisms. "Cucullanus elegans" is a species of parasitic nematode. It has disinfectant action against some parasitic organisms. These mites are largely parasitic and consume blood, skin and keratin. A large number of infections and parasitic diseases affect dugongs. Platyhelminthes (flatworms) form another worm phylum which includes a class of parasitic tapeworms. Such effects are most severe in mutualistic and parasitic relationships. This occurs in response to parasitic infections. Mebendazole (MBZ) is a medication used to treat a number of parasitic worm infestations.