CDC's research shows that 70% of NCOV cases in the new outbreak in Massachusetts have adequate vaccines, making the officials tighten the mask.

This finding is very worrying and is an important discovery that leads to the recommendations to wear a mask of the Centers for Disease Control and Prevention (CDC).

According to the data published in the CDC in the weekly disease and death report, the new mining in Massachusetts has recorded 469 cases of community infections, which involve many events and summer gathers of people

Medical staff taking Covid-19 patients to ambulance in Boston, Massachusetts, USA, in April 2020.

Among the cases despite the full vaccination, 274 people appear symptoms such as cough, fever, headache, sore throat, muscle pain and 4 people hospitalized.

The results of the number of contaminants also determined that the Delta strain existed in 90% of the patient samples from 133 infected people.

However, the US CDC also notes that when the vaccination rate increases, those who have vaccinated with large quantities of infections.

CDC in May relaxing the mask regulation, allowing those who to take two doses will not need to wear outdoor masks even in crowded places.

However, in the recommendation adjusted on July 27, CDC suggested that the person who had a full vaccine injected with a mask when going to a public site with a closed environment in areas is recording a sharp increase in infections.

Despite many studies show concern that the Covid-19 vaccine is ineffective with the Delta transformation, the US health authorities still claim effective vaccines to this strain and have the ability to protect people in the risk

US Health Officials this week continues to emphasize about 97% of hospitalizations and about 99.5% of NCOV deaths in the country are those who have not been vaccinated.