By Dr. Peter McCullough, America Out Loud - How did Omicron secure this large and growing ecological niche? We have learned that Omicron replicates at a 70-fold increased rate over Delta. Additionally, Omicron appears to generate immunity not only against itself, but also against Delta, the prior dominant variant. So as Omicron moves through the population rapidly, it provides a larger immunologic barrier to further Delta expansion and will likely work to bring down the Delta curve while the Omicron peak continues to build in a sharply upward and hopefully brief spike in cases.