Johnson to Warn U.K. as Delta Gains in Asia, U.S.: Virus Update Bloomberg 38 mins ago (Bloomberg) -- Authorities toughened social-distancing rules in Bangkok, Seoul, and parts of Vietnam as the fast-spreading delta variant of the coronavirus continues to make gains. Tokyo entered its fourth state of emergency and Sydney had a 45% spike in daily cases. The U.S. had the most cases since mid-May as delta hit less-vaccinated parts of the nation. Anthony Fauci, the top U.S. infectious disease specialist, said “ideological rigidity” is stopping people from getting Covid-19 shots. French President Emmanuel Macron will address the nation today amid a surge in infections, and U.K. Prime Minister Boris Johnson will today warn people to stay vigilant as he prepares to lift virtually all remaining curbs in England.