The information that we get when we know that the point at which the bacterial growth touches the strip is you know the concentration of a chemical that bacteria are resistant to.
According to the e-test, when the bacterial growth touches the strips then this means that they are growing in the zone of inhibition. Only those bacteria can grow in the zone of inhibition that is resistant to the particular antibiotic.
Hence, when the bacterial growth touches the strip we get to know the concentration of bacteria that have moved to the zone of inhibition and still managed to grow. This causes the bacteria to grow in resistant environments.
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