It seems that new proportions will appear continuously about the effectiveness of vaccines, especially with the development of Corona virus mutants.
In the new of these percentages, new US statistics showed that 25% of the number of infections among the residents of Los Angeles County, California, were among the two fully vaccinated against the virus during the period between May and July 25, according to Reuters.
This came in the weekly report of the Centers for Disease Control and Prevention in the United States, which was based on local studies conducted in order to determine whether Americans need a booster dose of the vaccine to enhance protection against the virus.
The new study, the results of which were published on Tuesday, included more than 43,000 people infected with the Corona virus in Los Angeles County, who are 16 years old or older.
And 10895 cases or 25.3% of infections were among those fully vaccinated, 1431 cases or 3.3% among those vaccinated with a single dose, and 30,801 cases or 71.4% in unvaccinated people.
In addition, the study indicated that the decrease in the effectiveness of vaccines coincided with the “delta” mutated from the Corona virus that overwhelmed the infection cases, as the effectiveness of vaccines decreased from 91% to 66%, according to the report.
It is noteworthy that last week, American scientists working for government agencies presented a strategy to give booster doses, starting next September 20, and they are awaiting evaluations from the Food and Drug Administration and the Centers for Disease Control.