The US allows injecting Vaccine Covid-19 to enhance the entire population, starting September 20, with the individual criteria that have been injected with an 8-month vaccine.

Available data shows very clearly the ability to Vaccine Covid-19 protects the body from the NCOV begin to decline over time after the original nose.

Vaccine warning officials are still significantly effective in reducing the risk of serious cases, hospitalization and Covid-19 deaths, but protection capabilities may decrease in the coming months if not added.

We conclude that it will take an enhanced injection to maximize the protection capacity as well as prolong the stability of the vaccine, the announcement mentioned.

Medical staff prepared Pfizer's Vaccine Covid-19 for a teenager in the city of Los Angeles, California, USA today.

The enhanced injections begin to be deployed from September 20 for those who have injected enough vaccines of Pfizer or Moderna for 8 months.

New York Times on August 16 reported that the US could start providing the earliest vaccine of Covid-19 vaccine in mid-September and the medical authorities intended to use the same type of vaccine who had previously injections for the nose

The United States last week approved forced to enhance the people with impulsive systems.

The latest decision highlights the concern about rapid increase in some US states, when the country's mass vaccination program encountered protest from political conservative areas in the South and Central

Incorporating Vaccine Covid-19 Increasing is still a controversial problem because it is unclear how many people need to inject and the frequency.

The World Health Organization (WHO) recommends that countries do not have to rush to increase the dose to ensure the supply of vaccines for poorer countries.