Two lecturebtype videos introduce pathogenic Bacteria and Helicobacter pylori. The first video gives a lecture about how human beings protect themselves from bacteria incursion: (1) phase 1, non-induced innate immunity, (2)phase 2, induced innate immunity, (3)phase 3, induced adpative immunity. The second video introduces how H. pylori causes the diseases in human stomach, introducing Cag A.

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