Teton Wilderness, Wyoming. Part of one of the largest contiguous wild areas in the United States, Teton Wilderness bridges the area between Grand Teton National Park and the especially remote southeast corner of Yellowstone, and is bordered by two other federal wilderness areas within Bridger-Teton National Forest.
Four doses of polio vaccine (IPV) are routinely recommended for U.S. children at ages 2 months, 4 months, 6-18 months, and 4-6 years. The first dose may be given as early as age 6 weeks.
The WHO recommends a minimum interval between dose 1 and 2 of 4 weeks, and a minimal interval between dose 2 and 3 of 4 weeks. Once again, the vaccine schedule of doses given at 6, 10, and 14 weeks has seroconversion rates identical to schedules with longer intervals between doses.