Acquiring skills: Transferable training and poaching externalities

An intravenous injection apparatus comprising at least a pair of filters serially arranged between opposite ends of an intravenous injection set, and a needle adapter and filter and method of making same, wherein the adapter includes a housing having a bore therethrough and an insert positioned within said bore, said insert having a bore therethrough and a unique filter presealed to said insert across the bore through the insert to filter contaminants from material flowing through said needle adapter.