An investigation by the Department of Health and Human Services' Office of the Inspector General found that many providers of immunizations meant for low-income children don't store the vaccines at proper temperatures, potentially rendering them ineffective and placing children at risk for contracting serious diseases. Inspectors visited the offices of 45 providers in five states who offered free immunizations as part of the government's Vaccines for Children Program. Nationwide, about 44,000 offices and clinics participate in the program. The investigation found that 76 percent of the providers stored the vaccines at temperatures that were either too hot or too cold. They also found that 13 providers stored expired vaccines along with nonexpired vaccines. As a result, the 20,252 VFC vaccine doses that we observed during site visits may not provide children with maximum protection against preventable diseases and may be vulnerable to fraud, waste and abuse," according to the report. "These doses were worth approximately $800,000."