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Our bodies and illness…read more

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Microorganisms that cause disease are
called pathogens. The most common
pathogens are viruses and bacteria.…read more

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Infectious disease
· An infectious disease is caused by a pathogen
entering your body and attacking it
· Infectious means the disease can be passed
from person to person
· Infectious diseases can be mild (such as the
common cold and tonsillitis) or can be more
serious (such as tetanus and influenza or HIV)…read more

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· Single celled living organisms
· Many forms are harmless
· Can be used to make yoghurt and cheese
· Can be used to treat sewage
· Can be used in medicine…read more

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· Even smaller than bacteria
· Usually have regular shapes
· Cause disease in every living organism…read more

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