The team from the University of Texas at Austin analysed blood plasma samples from four people who recovered from SARS-CoV-2 infections.
The Centre has announced that all individuals aged above 18 years would be eligible to get COVID-19 vaccination starting May 1.
The CT value refers to the number of cycles needed to amplify the viral RNA of the SARS-CoV-2 virus in a sample to detectable levels, in a standard RT-PCR test.
The N440K variant has immune-escape capabilities, meaning it can breach the immune system despite the presence of antibodies in the human body.
The study has several limitations, including a lack of clinical evidence quantifying the durability of the vaccines when administered under different schedules.
The differences could help explain serious lung inflammation and blood clotting symptoms and could be used to identify potential targets for developing therapies.
The increase in COVID-19 positive cases among children could be attributed to more elderly people venturing out of their homes after receiving the vaccination.
'Even after a previous infection and the presence of antibodies, vaccination is still necessary to boost immune responses, prevent reinfection and reduce transmission.'
The steep incline in cases is very concerning, says Manisha Juthani, Associate Professor of Medicine and Epidemiology at Yale School of Medicine.
An adenovirus isolated from chimpanzee poop, which has been genetically changed so that it is impossible for it to grow in humans, is used to make the vaccine.