  In this paper we analyze the impact of vaccinations on spread of the COVID-19
virus for different age groups. More specifically we examine the deployment of
vaccines in the Nordic countries in a comparative analysis where we analyze
factors such as healthcare stress level and severity of disease through new
infections, hospitalizations, intensive care unit (ICU) occupancy and deaths.
Moreover, we analyze the impact of the various vaccine types, vaccination rate
on the spread of the virus in each age group for Denmark, Finland, Iceland,
Norway and Sweden from the start of the vaccination period in December 2020
until the end of August 2021. We perform a three-fold analysis: i) frequency
analysis of infections and vaccine rates by age groups, ii) rolling
correlations between vaccination strategies, severity of COVID-19 and
healthcare stress level and; iii) we also employ the epidemic Renormalization
Group (eRG) framework. The latter is used to mathematically model wave
structures, as well as the impact of vaccinations on wave dynamics. We further
compare the Nordic countries with England. Our main results are the
quantification of the impact of the vaccination campaigns on age groups
epidemiological data, across countries with high vaccine uptake. The data
clearly shows that vaccines markedly reduce the number of new cases and the
risk of serious illness.
