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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
Nearly all drugs pass into human breast milk. How often a drug is taken influences the amount of drug that will pass into the milk. Medications taken 30 to 60 minutes before breastfeeding are likely to be at peak blood levels when the baby is nursing.
Medication errors are more common among seriously ill patients than with those with minor conditions.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.