Lice Populations (IMAGE) American Chemical Society Caption Lice populations in the states in pink have developed a high level of resistance to some of the most common treatments. Credit Kyong Yoon, Ph.D. Usage Restrictions Please credit Kyong Yoon, Ph.D., when using the image. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.