Upto some extent below mentioned article could throw some light....
doi: 10.3389/fimmu.2019.01317
May be the series of vaccination which all young children go through, provide active immunity against many organisms. This cluster of (active) immunity may be the probable reason for milder infections.
yes, but I think in very little percentage depended on the immunity of child and type of vaccine
Dharmendra Kumar attached please find another potentially useful article in which this question is addressed.
Data published on infected people with COVID in China, Italy, and South Korea showed that children are generally less affected by the disease. It is hypothesized that such immunity among children is related to early childhood vaccination, particularly anti-measles and anti- rubella vaccinations.
Article Does Early Childhood Vaccination Protect Against COVID-19?
Please have a look at the following link:
Article Routine childhood immunization may protect against COVID-19
You may follow the link below:
Preprint MMR Vaccine Appears to Confer Strong Protection from COVID-1...
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