For this lesson, try and answer the following questions in your books.  Use the internet to help you, there are several links below that may help.

1. What are three problems/diseases that bacteria can cause for humans?
2. Where might you find the bacteria vibrio cholerae?
3. Define the word pathogens:
4. How can people stop the spread of pathogens?
5. Why do you think that microbes like bacteria and protozoa have only been discovered since the microscope was invented?
6. How do protozoa move?

Talking about the microscope: http://www.typesofbacteria.co.uk/how-when-were-bacteria-discovered.html
BItesize site with lots of information about microbes: http://www.bbc.co.uk/schools/ks3bitesize/science/organisms_behaviour_health/disease/revise1.shtml
Have a go at the games on this site once you're finished:
http://www.themicrobiologyblog.com/2010/05/microbiology-games.html