Before revision: The Centers for Disease Control and Prevention lists vaccination as one of the ten great public health achievements of the 20th century in the U.S. Mechanism of function upright=0.8|In Sweden, polio vaccination started in 1957.
After revision: We must taking vaccine because vaccine prevent disease so for taking vaccine government open vaccination program....The Centers for Disease Control and Prevention lists vaccination as one of the ten great public health achievements of the 20th century in the U.S. Mechanism of function upright=0.8|In Sweden, polio vaccination started in 1957.