1. The addition of heat-inactivated immune serum did not enable leukocytes to kill Amebae, nor did it protect these host cells from Amebae.

2. Acid stress caused no detectable alterations in lipooligosaccharide migration and (or) staining, in outer membrane protein profiles, or in immune serum recognition of outer membrane components from Neisseria mucosa or Neisseria sicca.