The decision follows a review of a pilot programme deployed since 2019 where more than two million doses were given of the vaccine.
Lead prosecutor says Section 30(7) of the MACC Act referred to by the defence deals with exemption from prosecution, not immunity.
The authors say the finding helps illuminate why children are less susceptible to severe Covid-19 than adults – though this is still an area of very active research and many factors are believed to be at play.
Those who have contracted Covid-19 may be able to fight the virus off for at least six months due to cells that 'remember' the virus for a period of time.
With only three admitted to the hospital due to side effects from the vaccines, India says its vaccination process is on to a successful start.
But researchers say early evidence from the next stage of the study suggests that some of these individuals carry high levels of virus and could continue to transmit it to others.
Experts say it is very likely that the immune system will remember the virus if re-exposed later on, and then produce new antibodies.
British medical journal The Lancet cited studies which suggest that vitamin D may be able to protect against acute respiratory infections such as Covid-19.