Bilthoven Biologicals is a biopharmaceutical company that focuses on the production of vaccines against infectious diseases. It provides a range of products, including inactivated polio vaccines (IPV), tetanus vaccines, diphtheria-tetanus-polio vaccines (DT-PV), and Bacillus Calmette-Guérin (BCG), which is known as a tuberculosis vaccine and can also be used for the treatment of bladder cancer.