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These take instructions from the white blood cells known as dendritic cells, which he refers to as the "generals" of the immune system.

Leukaemia is a type of blood cancer that affects blood cells in your bone marrow – usually white blood cells, Blood Cancer UK said.

HLH is an immune deficiency disorder which happens when certain types of white blood cells, known as histiocytes and lymphocytes, become overactive and attack the body.

The Mayo Clinic says it’s a non-Hodgkin’s lymphoma that occurs when white blood cells turn into cancer cells and build up in the spongy material of the marrow.

Benralizamab is a monoclonal antibody which targets specific white blood cells, called eosinophils, to reduce lung inflammation.