CRP is highly variable in chronic infectious diseases
conventional ID doctors will tell you things like you cannot have an infectious disease is you have a low CRP - but a quick review of the studies on pubmed for CRP levels with things like Bart - and it shows 50% of the time they are entirely normal.
but i think it can also be raised during herx - when many bodily functions will be off - and inflammation generally is raised
potentially also due to the vaccine - as that will cause an immune response of sorts also
as above - if concerned - best to have it tested again in a couple of weeks
6 is not that high - in acute diseases it can be 500 or more
C-reactive protein level (in milligrams per liter of blood) in adults What it means
Below 3.0 Normal
3.0 – 10.0 Slightly elevated, which may signify a variety of conditions such as pregnancy, the common cold, or gingivitis
10.0 – 100.0 Moderately elevated, which signifies infection or an inflammatory condition such as rheumatoid arthritis (RA), Crohn’s disease, or lupus
100.0 – 500.0 Elevated, which signifies infection, inflammation of the blood vessels, or major trauma
500.0 and above Severely elevated, which signifies severe bacterial infection
see
https://www.healthline.com/health/rheumatoid-arthritis-crp-levels#normal-crp-levels