Dodongo

I think the reason NPs do not have the 2 years OR experience requirement is because, unlike RNs, their practice is not governed by AORN in anyway. NPs can and do first assist in the OR without completing an RNFA program (they are above the rules governing RNs so to speak), whereas RNs cannot practice in that role without further education.
State boards of Nursing allow NPs to essentially do whatever, whereas they require RNs to be formally trained... I don't agree with this at all, but... it's happening.

Infiltrate is when your alveolar spaces are filled with some sort of fluid, i.e. transudate, exudate. Consolidation is more of a measure of the texture and hardening of the lungs. But on a CXR you can't distinguish between the two. Certainly when tied to a clinical history and physical exam you can piece together what's happening more precisely, but without that a better term would be "opacification" or even just "density", as these are broader, and with less context or effect on implying disease process.