The United States Centres for Disease Control and Prevention (CDC) has urged that the world should return to universal masking mandates. 

The CDC document urges for the urgent need for vaccination of the health workers and reinforcement of universal masking. 

"Acknowledge the war has changed," the document entitled "Improving communications around vaccine breakthrough and vaccine effectiveness" said. "Improve communications around individual risk among vaccinated."

The document also made it clear that unvaccinated people are 10 times more likely to get ill or die by the virus than their vaccinated counterparts.

"High viral loads suggest an increased risk of transmission and raised concern that, unlike with other variants, vaccinated people infected with Delta can transmit the virus," CDC head Rochelle Walensky said in a statement.

The study was based on an outbreak in Massachusetts in which almost three-fourth of those infected had been vaccinated.

The CDC has said that as of July 26, 6,587 people have experienced breakthrough COVID-19 infections after being fully vaccinated and were hospitalized or have died. It stopped reporting on mild infections this spring but in the report, it estimated that there were about 35,000 symptomatic infections each week in the United States.

The World Health Organization chief Tedros Adhanom Ghebreyesus said that the hard-fought battles are being lost as the countries have been overwhelmed by the Pandemic.

"We are fighting the same virus but a virus that has become fitter," WHO's top emergency expert Mike Ryan said. He also noted that despite being not effective to control infection the vaccine still prevents severe illness and death.

Countries across the world have been hard hit by the delta strain of the coronavirus. The Asian countries like Japan, Philipines which had been pretty successful to control the first wave of the virus have been overwhelmed with cases now. 

Even in the countries like the USA and the UK where the majority of people have been vaccinated the number of cases is surging, though the death rates have been low.