The word "infective" means something that has the ability to cause an infection or spread a disease. Full definition
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It is generally assumed that horses housed in barns with manure collected every day or two from the stalls are not at risk of ingesting infective larvae of internal parasites (cyathostomines) unless they are turned out on pasture. (equimanagement.com)
The Centers for Disease Control states that if conditions are right, eggs can develop into infective stage larvae in as few as five days. (cat-lovers-only.com)
Microfilariae can not become infective larvae without first passing through a mosquito. (waterlooanimalhospitalok.com)