While over half of people are sensitive to poison ivy and will react by developing the characteristic rash about 1015 of the population is highly sensitive and may have particularly severe symptoms or develop symptoms after a very mild exposure

What is the correctly punctuated version of this sentence?
While over half of people are sensitive to poison ivy and will react by developing the characteristic rash, about 10%-15% of the population is highly sensitive and may have particularly severe symptoms or develop symptoms after a very mild exposure.