Younger age groups, because of the amount of infection there has been, the naturally enquired immunity, coupled with the vaccination programme, those age groups are reaching herd immunity and that will bring cases down and help drive down the cases in the older age groups, coupled with the boost it programme, that will provide more protection. i was talking to a scientist at the end of last week was saying the government can't rely on herd immunity. clearly, the herd immunity we are talking about, the younger age groups, and the all the great groups have still got to rely on the effectiveness ...