The Delta variant is predicted to increase to the high 80 percent level while all the other three are predicted to stay below the 9 percent mark of total cases.
The Delta variant could be more than twice as transmissible as the original strain of SARS-CoV-2, the virus causing Covid-19.
CIA Director William Burns says that Russia could be responsible, but Moscow has denied involvement.
According to the study, 95 per cent of individuals who received two doses of the Sinopharm vaccine have developed antibodies similar to a naturally infected Covid-19 person.
Medical experts have not yet been able to determine the exact cause of the mysterious illness.
The Delta variant constitutes around 83 percent of the recent Covid-19 cases in the United States.
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How Covid-19 manages to trigger the production of a variety of autoantibodies, including anti-NETs remains unknown.
The researchers stated that the natural distribution of sarbecoviruses and opportunities for recombination through intermediate host co-infection have been underestimated.
The team found that 98.8 per cent of people infected in February/March showed detectable levels of antibodies in November.
Investigators Believe the Leak was Some Sort of Mixture of Bleach and Sulfuric Acid
The risk of a child being admitted to hospital due to COVID-19 is small, but among those hospitalised, brain and nerve complications occur in almost 4 per cent.
The infected Texas resident had recently traveled from Nigeria to the United States.
The study included 263 participants who all tested positive for SARS-CoV-2 within seven days before entering the study.
The Nigerian official was diagnosed with Covid-19 on Thursday evening at the airport; the person had mild symptoms.