Whilst we are in the midst of the coronavirus Covid-19 crisis, there has never been a more important time to keep your immune system fit and healthy. The immune system is our bodies defence against invading bacteria, viruses, fungi, parasites and other pathogens. It is a complex network of hundreds of specialised cell types and organs and is the second most complicated structure in the body, after the brain. Specialised cells called neutrophils, macrophages, lymphocytes and other white blood cells…