1. Each protozoon makes a biassed random walk about the screen.

2. In the oral cavity protozoon due to its harmfulness has not received enough attention, at the same time because its hard to kill, so the oral health and health caused great potential danger.

3. The evidence for a significant role for cell-mediated immune responses in other protozoon diseases of animal is less complete.

4. Third, the lessons learned abroad, an increase of the body of protozoon virus detection.

5. Sophora flavescens has high efficacy of anti - parasites. The diverse compositions of S. flavescens have different functions on helminth , protozoon and mite.