Another place that bacteria become resistant to antibiotics is at home.
One researher named Merri Moken proved that frequent use of household cleaners can be bad.
The bacteria on her kitchen counter changed to become resistant tothe household cleaner.
Even after cleaning the kitchen, there were still bacteria on the counter.
All of this poses a big challenge to doctors and scientists.
It makes it difficult for them to help people get better.
If antibiotics only work some of the time, what wiil we do when we are sick?