First, Justin Bieber infected COVID-19 because Justin Bieber was preparing for his concert tour. Because too many people contacted him, he was infected with the virus, and now Justin Bieber's concert tour is temporarily suspended. Although Troye Sivan did not hold a concert tour, Troye Sivan was also preparing his own concert, and many people contacted him. In addition, the United States is completely indifferent to the epidemic now, so Troye Sivan will be infected.
Secondly, although the epidemic abroad is very serious, it is actually not as terrible as everyone thinks. After many people who have been vaccinated are infected with COVID-19, the symptoms are actually very mild, which may only be mild symptoms such as runny nose, dizziness and brain fever. Troye Sivan's agent also said that Troye Sivan is in a good mental state, but he must be isolated to avoid infecting others.
Finally, the epidemic situation abroad can't be controlled because it is too free. Now many foreign hospitals can discharge patients infected with COVID-19 virus. Many patients still don't follow the doctor's advice and go to restaurants and cinemas without masks after discharge, which leads to the increasingly serious epidemic situation abroad.