However, the study published recently in the journal JAMA Pediatrics does not imply that breast milk antibodies can provide protection against COVID-19 for nursing children.
The 73 were divided into two groups -- those who were infected at 90 days or closer to the first vaccine dose, and those whose exposure to the virus was more than 90 days before the initial shot.
The Health Department has treated Covid-19 patients at government medical college hospitals with monoclonal antibodies, according to senior officials.
The relatively high seroprevalence among children indicates that school reopening will not pose major concerns, according to health experts.
While sero-positivity was the highest 93.9 per cent among the healthcare workers, it was around 70 per cent in the 6-10 age group and 74 per cent among the people aged 11 to 18 years.
This raises questions on the need for a booster dose, or third dose, six months after the second dose.
The UN health agency said the new advice was based on evidence from experimental trials, including a British-run study that is the world's largest for testing potential COVID-19 treatments.
The research team led by NYU Grossman School of Medicine in the US found that 100 per cent of the infants had protective antibodies at birth.
Researchers at the Rosalind Franklin Institute in the UK found that nanobodies -- a smaller, simple form of antibody -- can effectively target the SARS-CoV-2 virus.
The researchers studied the convergent antibodies' ability to bind to several variants and found that they no longer bound to some.
Several people have been approaching private hospitals and labs for testing their antibody levels to check the efficacy or response of the Covid vaccination.
ICMR’s Bhubaneswar centre study finds higher antibodies in those who took Covishield vaccine compared to Covaxin.
The study noted that the boosters are even more important as the Delta variant spreads.
Senior doctors with the GMCH say the low immunity could be a reason why Gafoor kept getting infected, especially since he was continuously exposed to Covid patients.
The drugmaker says researchers saw an increase in antibodies nine-fold higher than levels seen about a month after the first dose of the vaccination was administered.