In chapter 7, you have read that microbes cause a large number of diseases in human beings. They also cause diseases in animals and plants. But this should not make you think that all microbes are harmful; several microbes are useful to man in diverse ways. Some of the most important contributions of microbes to human welfare are discussed in this chapter.
A public health poster contrasts “not all microbes are harmful” with “antibiotics saved lives.” Which pairing is accurate?
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