16:30Am I Normal?Series 8Episode 2BBC Radio 4 Duration: 30 minutes Wed 27th Jul 2011, 16:30 on BBC Radio 4 LWAvailable 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