The vaccine used for hundreds of thousands of children was recalled, because after undergoing some tests it is proven that those vaccine are not strong enough or as the government put it ‘has lost some of its strength’. Unfortunately the vaccine which was made by Sanofi Pasteur was already being distributed across the country last month and most have already been used, according to the Centers for Disease Control and Prevention. The 800,000 pre-filled syringes that were recalled are for young children, ages 6 months to nearly 3 years.