(Sharecast News) - Pharmaceuticals giant Shire on Thursday said it had bought Switzerland's sanaplasma AG for an undisclosed sum.In a statement, Shire said the deal would increase its access to plasma in the longer term and add to its European collection network, "complementing existing core capabilities in plasma supply and manufacturing"."Plasma is essential to the manufacture of immunoglobulin therapies that help treat patients living with certain rare immunological diseases," Shire said.Immunology is Shire's largest franchise, with 18% growth on a pro-forma basis in 2017 to $4.4bn in product sales."This acquisition is expected to support the growth of the immunology business and help meet the needs of patients around the world," the company said.Sanaplasma has 14 plasma centres in the Czech Republic and Hungary.