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Unit 19: Biology Part 2 Page 80 of 137
and infectious diseases are caused it is important to take all the
by pathogens. The reason why medication, even if you start
infectious diseases can spread from feeling better. If you don’t do this,
one person to another is because the strongest bacteria may survive
pathogens can spread from one and come back to make you sick
person to another. later.
One group of pathogens are Infectious diseases can also be
bacteria. Bacteria are one-celled caused by fungi. Fungi are simple
living things with no nucleus. living things made of one or more
Although most bacteria are cells. Like bacteria, many fungi
harmless, and some are even are perfectly harmless. In fact,
helpful, some do cause disease. mushrooms and yeast are both
The most common disease caused fungi. However, some fungi cause
by bacteria is tuberculosis, which is diseases including ringworm and
often abbreviated TB. TB is a athlete’s foot.
disease of the lungs that is very
serious. Bacteria also cause strep
throat, some types of pneumonia,
and many food borne diseases.
Figure 67 – The fungus
Epidermophyton floccosum
causes athlete’s foot.
These two disease are not very
Figure 66 – These bacteria serious, and can be treated with
cause strep throat. anti-fungal medication. Fungi can
cause some serious diseases as
Bacteria can be treated with well, including a lung disease called
medications called antibiotics. If histoplasmosis.
you are ever given an antibiotic to
treat a disease caused by bacteria,
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