It can be caused by an infection, virus, bacterium or parasite.
它可以引起的感染，病毒，细菌或寄生虫。
The vaccines of tomorrow are likely to be far more sophisticated concoctions, made up of snippets of raw DNA from the genome of a virus, bacterium or parasite.
明天的疫苗有可能是极为尖端的复合物，由病毒、细菌或寄生虫基因组的原始DNA的小片段构成。
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