A method for producing vaccines comprising applying ultraviolet light of wavelength 100nm to 280nm at an intensity of 5000-80000 milliwatts per square centimeter to cultured viral and bacterial pathogens (without extensive antigenic variation) rendering them incapable of reproduction or sustained function； collection and incorporation into fluids for introduction into animal tissues thereby stimulating an immunological response resulting in the development of antibodies or immunoglobulin for the virulent form of a specific pathogen when introduced into animals' tissues.
