Any process involved in the activation of any of the steps of the alternative pathway of the complement cascade which allows for the direct killing of microbes and the regulation of other immune processes.
complement activation, classical pathway +
complement activation, lectin pathway +
hemolymph coagulation
host-mediated suppression of symbiont invasion
induced systemic resistance +
innate immune response in mucosa
innate immunity memory response +
melanization defense response +
natural killer cell activation involved in immune response +