It's a cruel irony that babies pick up every possible infectious disease known to mankind with the slightest provocation, but recover at an unparalleled rate, while their fathers get sick incredibly rarely but become absolutely useless for 5 days when they do get a cold.
Luke got a cold. Luke was over it in two days. Ryan got Luke's cold. Ryan felt like death this weekend and has still not fully recovered after 5 days. Ryan feels it is unfair that Luke has half* his immune system but is far more efficient at this virus-clearing business. On the plus side, spent a lot of time in ME3 multiplayer because hands and eyes still worked, despite nose and throat's attempts at mutiny.
(*Yes, I know how immunology works and that this word is an outright lie, just run with it).