The disease tuberculosis caused an epidemic in London during the 19th and 20th century. This very dangerous and many times deadly disease was found to take many different forms. These different types of tuberculosis are divided into two main categories, pulmonary and non-pulmonary tuberculosis. This disease killed a large portion of the population in England. Some of these trends in morbidity and mortality can be explained by external factors occurring in the country. One of the ways this disease infected a large portion of England was due to it infecting livestock and being spread through milk and food. Tuberculosis dispensaries were established. In the 1940s tuberculosis vaccines started to be developed, which helped stop the spread of this disease.