Borrelia burgdorferi is an example of a _____ vaccine.

Borrelia burgdorferi, the bacterium responsible for Lyme disease, is targeted by a recombinant vaccine. Recombinant vaccines are created using genetic engineering techniques, which involve inserting segments of the pathogen's genetic material into another organism, typically a yeast or bacteria. This process allows for the production of specific proteins that can then be used to stimulate an immune response in the host without introducing the live pathogen itself.

The use of a recombinant approach for Borrelia burgdorferi targets specific antigens that provoke immunity against the infection, allowing for effective protection while minimizing the risk of disease. This represents a modern and innovative approach to vaccination that often results in fewer side effects and can provide effective immunity.

In context, other types of vaccines like inactivated, live-attenuated, or toxoid do not apply to Borrelia burgdorferi because they are made by different methods. Inactivated vaccines contain killed pathogens, live-attenuated vaccines use a weakened form of the pathogen, and toxoid vaccines are derived from toxins rather than the pathogens themselves.