ebp rsv collection

We currently are trying to change policy on RSV collection. Over the years we have gotten away from the old cut tip saline lavage pull with syringe method and have gone to using ETT suction caths into Lukey sputum traps. This is much gentle and sterile on part of patient. But of course as with anything else- i need some evidence to support that this is appropriate to do. Any help out there?
thanks