Contaminated water has to be boiled before it can be drunk. Contact - close contact with a person or animal infected with a microbe can spread this to other people. Coughing and sneezing sprays droplets of moisture into the air containing microbes which are then breathed-in by others. Flies and rats also carry diseases. This section tends to be tested in the Higher papers .
Antibodies are very clever.
There must be a different antibody for each type of microbe. The body can remember the antibodies it has made. If it is invaded by the same type of microbe again, it uses this memory to produce loads of the antibody very quickly. This is called Immunity . The body is then immune to that microbe.