Infectious disease expert Dr. Anthony Fauci is cautioning that there could soon be “two Americas” – one where most people are vaccinated for COVID-19, and another where low vaccination rates could lead to a surge in new cases with the Delta variant looming large over the country. “When you have such a low level of vaccination superimposed upon a variant that has a high degree of efficiency of spread, what you are going to see among under-vaccinated regions, be that states, cities or counties, you’re going to see these individual types of blips,” he said this week.