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The antibiotic kills the rest of
the non-resistant bacteria so
the person may start to feel
a little better. The resistant
bacterium has survived the
antibiotic and continues
to multiply.
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There is variation in the
bacterial population. One
bacterium develops a
mutation by chance that
means it is resistant to
an antibiotic.
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One strain of the bacteria
has been killed, but the new
strain is not affected by the
new antibiotic. It survives
and reproduces. This strain
is resistant to multiple
antibiotics, it will spread
quickly because nobody
is immune to it.
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The antibiotic kills some of
the bacteria, the resistant
bacterium survives and
reproduces.
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The doctors prescribe a new
antibiotic. It kills most of
the bacteria, but the newly
resistant strain survives and
multiplies. It no longer needs
to compete for resources with
the older strain.
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The resistant bacterium has
multiplied, they no longer
have competition from the
other bacteria. The person is
likely to feel ill again. This
time the antibiotic won’t
work. One bacterium
develops a random mutation
which means it is resistant
to another antibiotic.
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