As the natural route of infection with tuberculosis is through inhalation of droplets into the lungs, this study, which delivers BCG by the same route, is hoped to be better at stimulating the immune system.
Professor Helen McShane, Professor of Vaccinology and Chief Investigator of Tuberculosis Vaccine Trials at the Jenner Institute, said: ‘Tuberculosis kills more people than any other infectious disease and we urgently need better vaccines. This important new study will help us to see whether giving BCG more than once stimulates a stronger immune response and whether giving it by inhalation is better than giving it into the skin. Small studies like these are really important to help us understand the immune response in people and allow us to design and test better vaccines.’
This study will also explore whether giving people with Type 2 diabetes BCG in the skin stimulates as strong an immune response as giving BCG in the skin to healthy people without diabetes. People with Type 2 diabetes are more likely to get tuberculosis and part of this may be because the BCG vaccine does not work as well in this group.
This study will recruit healthy volunteers, with and without Type 2 diabetes, who have previously been vaccinated with BCG. The volunteers will be split into 3 groups of 12 volunteers each. If eligible, volunteers will receive the BCG vaccine either as an injection via the skin or as an inhaled vaccine. All participants will be followed up for 6 months after receiving BCG with close monitoring for side effects and to evaluate the immune response.
Tuberculosis is a disease caused by a bacterium known as Mycobacterium tuberculosis and remains one of the top 10 causes of death worldwide and the largest infectious killer. BCG given as a single dose under the skin, is the only vaccine currently licenced for use against tuberculosis, but it is not always protective. The BCG vaccine works well against disease in childhood, but it is not good enough at protecting against disease in adulthood, which is when the majority of tuberculosis deaths occur.
Aye Thu, Clinical Research Fellow Centre for Clinical Vaccinology and Tropical Medicine at the Jenner Institute said: ‘Despite BCG vaccine being around for more than 100 years, tuberculosis remains the leading cause of death from an infective cause. A significant proportion of the population infected with tuberculosis continues to get sick and die even with medication. Having a new way of optimizing the BCG vaccine will ultimately improve the health of people all over the world. This study will give the participants an opportunity to get involved in testing an exciting new way of delivering BCG vaccine through the aerosol route.’