What type of vaccine is developed from killed microbes that contain recognizable antigens?

The answer is inactivated whole agent vaccine, which is developed using killed microbes that retain their antigenic properties. This means that the inactivated form of the pathogen is used in the vaccine to stimulate the immune system without causing disease. The recognizable antigens present on the surface of the killed microbes trigger an immune response, helping the body to recognize and fight the actual pathogen if exposed in the future.

Inactivated whole agent vaccines are particularly useful for diseases caused by viruses or bacteria where there is a need for a safe vaccine that does not cause infection. The killed microbes ensure that even though the pathogen is no longer live, the immune system can still learn to recognize and respond to it effectively.

Other types of vaccines, such as live attenuated vaccines, contain weakened forms of the pathogen, and subunit vaccines comprise only parts of the pathogen (like proteins or sugars) rather than the whole organism. Toxoid vaccines are designed to neutralize toxins produced by bacteria rather than the bacteria themselves. Each of these alternatives employs different methods of stimulating an immune response and would not fit the definition of being developed from killed microbes containing intact, recognizable antigens.