21:00Am I Normal?Series 8Episode 2BBC Radio 4 Duration: 30 minutes Tue 26th Jul 2011, 21:00 on BBC Radio 4 FMAvailable for over a yearListen nowIs there such a thing as a normal immune system? Vivienne Parry investigates. Show more GenresFactualHealth & WellbeingBrandAm I Normal?SeriesAm I Normal?: Series 8 Source: BBC Online