Kids produce different types and amounts of antibodies in response to COVID-19

Children and adults produce different types and amounts of antibodies in response to COVID-19 infection, says a new study.

Since the beginning of the COVID-19 pandemic, experts have tried to figure out how the virus affects children. They have been tracking different cases to see the severity of the disease in kids as well as complications and long-lasting effects. Sometimes, the results are contradictory and, given the unpredictable nature of the disease, also confusing.

Now researchers from Columbia University Vagelos College of Physicians and Surgeons in the US have found that children and adults produce different types and amounts of antibodies in response to novel coronavirus infection. The differences in antibodies suggest the course of SARS-CoV-2 infection and immune response is distinct in children and most children easily clear the virus from their bodies, the study published in journal Nature Immunology reported. Antibodies are formed once you recover from a certain illness and these offer a certain amount of immunity against the disease for a certain period of time.

Kids cope better than adults with COVID-19 infection

Researchers say that this study provides an in-depth examination of SARS-CoV-2 antibodies in kids, revealing a stark contrast with adults. In kids, the infection course is much shorter and probably not as disseminated as in adults. Kids may clear this virus more efficiently than adults and they may not need a strong antibody immune response to get rid of it. One of the striking manifestations of the COVID-19 pandemic is that the majority of children cope well with the virus while older people struggle.

Mild as well as severe cases resulted in same antibody profile

Among the 47 children in the study, 16 were treated for Multisystem Inflammatory Syndrome in Children or MIS-C and 31 children of similar ages had tested positive for the virus after visiting the medical centre for the treatment of other conditions. Half of the children without MIS-C had no COVID-19 symptoms. The 32 adults in the study ranged from severely affected patients admitted to the hospital to those with milder disease who recovered at home. Both groups of children produced the same antibody profile, the study found, which differed from that of adults.

Antibodies produced are much less too

Compared with adults, children produced fewer antibodies against the virus's spike protein -- which the virus uses to infect human cells. The children's antibodies had the least neutralising activity, while all adults, including young adults in their 20s, produced neutralising antibodies. The sickest adults had the most neutralising activity. In contrast to adults, children also produced very few antibodies against a viral protein that is only visible to the immune system after the virus infects human cells. That suggests that in kids, the infection doesn't really spread a lot and doesn't kill a lot of their cells. Also, the antibody responses found in children do not suggest that children will have a weaker response to a vaccine, the researchers stressed.

(With inputs from IANS)