As the United States (US) is surpassing an average of 160,000 new Covid-19 cases a day, the spread of the more transmissible Delta variant and the return of many students to the classroom for a new academic year seriously concern officials and health experts.

The pandemic is not only stretching hospitals thin with the surge of patients, particularly unvaccinated people and children, but also wearing the country out in the fields of tourism, tech businesses and social welfare, Xinhua news agency reported on Thursday.