Books about microbes and micro-organisms will have a Dewey number of 576.
Here are some websites that may help your research…
Health and disease – this revision bite from BBC Bitesize has links to information about microbes, spreading microbes, defence against microbes and antibiotics.
Microbes from Key Stage 3 science has links to keywords, revision notes and a quiz.
Microbes and disease – here’s a quiz to test what you know about microbes.
Here are two pages from the BBC website that explain the good that microbes do and the harm that microbes do.
Germs, germs everywhere is a website designed by some primary school children that has lots of information about germs. They also have a page stating which sources they used to find their information. Could be worth a look.