Some microbes are harmful to us and some are not.
Yeast is useful to bakers and brewers. Yeast can change sugar into carbon dioxide and alcohol. Bakers need carbon dioxide gas to make the bread rise and brewers need to add the alcohol to their drinks.
Bacteria is also useful. Certain bacteria helps milk turn into yogurt and cheese out if it.
Some are diseases caused by fungi such as thrush and athlete's foot.
Microbes cause disease when they are able to reproduce. They produce harmful toxins and damage tissues and organs.
Antibiotics stop bacteria reproducing and kills all bacteria. They only work against bacteria.
Microbes have chemicals called antigens. Different microbes have different antigens.
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