It comes from faulty calculations and assumptions about R0.

Contrary to claims online, scientists say there is no evidence that the BA.5 version of the Omicron coronavirus variant is more transmissible than measles https://t.co/mdqGV7B0rW pic.twitter.com/zL4g4gkUdK

— Reuters Fact Check (@ReutersFacts) July 18, 2022