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Why do people still get polio in some countries and not in others?
On a busy street in Karachi, Pakistan, a health care worker kneels down so she's eye to eye with a toddler. She squeezes two drops of liquid onto the child's tongue.
Summary
On a busy street in Karachi, Pakistan, a health care worker kneels down so she's eye to eye with a toddler. She squeezes two drops of liquid onto the child's tongue. Then she takes out a purple marker and colors the child's pinkie fingernail so everyone can see that this toddler is now vaccinated against polio. During big vaccination drives, thousands of health workers like her knock on doors across Pakistan.
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