Please choose the correct ending to complete the given sentence: Health: [header] How to use ivermectin [title] Use ivermectin against certain worms. [step] Ivermectin is the drug of choice against several different kinds of worms. The two most common worms treated by this medication are strongyloides stercoralis and onchocerca volvulus.

Ending1: [substeps] Strongyloides sterandrinds are considered normal doses for severe cases of parasites that might have been avoided with the medication. Onchopropyl methylcellulose is also an additive to this medication. Ending2: [substeps] Strongyloides stercoralis: this worm is prevalent in northern parts of the united states and canada. It is found on soil and prefers warm humid conditions. Ending3: [substeps] Strongyloides steroid drugs target the stomach lining-doing this provides minimal blockage, with the rotation of the worm and lowering serotonin, which therefore reduces the digestive process in the worm. [title] Learn about the other drugs that were shown to work. Ending4: [substeps] Strongyloides are those that are found within worms and then paste a barrier barrier to prevent the worm from entering their eggs. Strongyloides stercorindermoids are injected into the worm once every 12 to 36 months.

Answer format: ending1/ending2/ending3/ending4