I've had low IGg's for a long time without major infections. I do get reactive airway problems, a form of asthma. Or it may be a low-grade virus. The doctor is making me take another pneumonia shot and then test my immunoglobins in 6 weeks. I took my last shot either 2005-2006. Some doctors talk about IV immunoglobins. Anyone here take this and what side effects if any have you experienced? Also, anything natural in supplements that help bring up the immune system? Thanks!