Without going into too much detail, immunity is a system with various defense components, each responsible for protecting against a specific type of infection.
The main components of defense against viruses are the NK (natural killer) and Th1 (T-helpers-1) cell lines . Roughly speaking, if these components dominate your immunity, viral infections will be mild or asymptomatic, but on the other hand, there is a risk of autoimmune reactions.
Other cell lines, such as B cells (which produce antibodies), Th2 (T-helpers-2) , and others, mostly "work" against bacteria, fungi, and parasites, but are ineffective against viruses (hello, COVID!). This is why any "measurement of the strength" of immunity against viruses (or after vaccination) using antibodies is utter nonsense.
From a practical standpoint, it is primarily important to determine your individual activity of certain components relative to others. For example, some people's immune systems are good at fighting bacteria but not viruses, and vice versa. This can be determined using an immunogram, which can be performed in any civilian laboratory. This analysis will show the concentrations of all the main immune cells, as well as their ratios.
Next, if we see a dominance of the components responsible for bacteria, then we need to shift the immune system to the dominance of the viral defense components. How can this be done? Take certain supplements (Google " TH1 TH2 supplements " and " NK cell-activating compounds ").
Personally, I use NOW IMMUNE RENEW . However, any supplement with a high amount of Astragalus membranaceus plant extract has the ability to stimulate the viral defense components of the immune system.
Links to evidence:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8324177/
https://www.mdpi.com/2227-9059/10/2/296
https://www.nature.com/articles/s41423-021-00825-2
https://pubmed.ncbi.nlm.nih.gov/34695836/
https://pubmed.ncbi.nlm.nih.gov/15015443/
https://pubmed.ncbi.nlm.nih.gov/17361521/
https://pubmed.ncbi.nlm.nih.gov/12205961/
