Change in blood levels of selenium and zinc;Change in the acute immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Change in the acute immune response to the influenza vaccine after supplementation (influenza vaccine groups);Change in the delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Change in the delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups)

Change in blood levels of selenium and zinc;Change in the acute immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Change in the acute immune response to the influenza vaccine after supplementation (influenza vaccine groups);Change in the delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Change in the delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups)

Change in blood levels of selenium and zinc;Improvement the acute and delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Improvement the acute and delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Improvement the acute and delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups);Improvement the acute and delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups)

Change in blood levels of selenium and zinc;Improvement the acute and delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Improvement the acute and delayed immune response to the Covid-19 vaccine after supplementation (Covid-19 vaccine groups);Improvement the acute and delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups);Improvement the acute and delayed immune response to the influenza vaccine after supplementation (influenza vaccine groups)