Dr. Amy Nett: I’ve also heard this idea that if we have a healthy immune system, we should be sort of having some immune response to colds or flus, but I think that we also have some people who are pretty healthy who are only getting the cold or flu maybe one once a year. If somebody’s truly never getting sick, it might be worth looking at their immune system. Certainly, doing a complete blood count, looking at the differential when you do the CBC, the neutrophils making sure you look at an absolute neutrophil, looking at the various immunoglobulin levels, so IgG, IgM, IgA, and maybe even looking at IgG subclasses. I don’t know that I’ve seen any studies specifically looking at a cohort of patients who are people who very infrequently get sick. I think you probably do have to think about the extremes on this spectrum, so those people who don’t get sick because they have a very strong intact immune system, and the colds and flus passed by so quickly they barely notice them or people who never get sick.