The interesting thing was that his blood work was not particularly exciting, but it did give what has become one of the most important markers now on your children. For the record, natural killer cells protect us against presumably cancerous cells, free radicals. Anything foreign to our body that doesn't belong there, natural killer cells are supposed to get rid of. As I found out at the NIDS Board organization meeting, shark's immune systems that we think of as so fantastic, are all natural killer cells.
Healthy adults have more natural killer cells.
As it turns out, this has actually become a very strong marker to me for the likelihood of a virus going on in the background.