Abstract
Hepatitis C virus (HCV) infects more than 180 million people worldwide and can lead to liver failure or liver cancer later in life. As Parham discusses in his thought-provoking Perspective, a step toward understanding how the human immune system resolves HCV infection and to developing a vaccine has been made with the finding that infected individuals of a particular genotype more readily resolve HCV infection than infected individuals of other genotypes ( Khakoo et al.).