Answer:
The
number of disease-causing microbes in the body decide the severity of disease
manifestation. If the number of microbes is very small, the disease manifestations
may be minor and even go unnoticed. But if the number of microbes is large, the
disease can be severe. In fact if the number of microbes is very large, the
disease can even be fatal. Our immune system is a major factor that determines
the number of microbes surviving in the body.
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