Immune System Basics
We have all figured out by now that there are certain factors that can help to slow the spread of viruses that cause COVID-19. This includes the well established concepts of public hygiene including washing hands with soap, sneezing or coughing into your elbow, or staying home if you know that you've got a bug causing problems in your body.
However, what we should also recognize is that your immune system is not simply out to fight viruses and bacteria, but to help your body learn and adapt to its environment.
Rather than thinking of the immune system as a war machine, we should think of it as a network of advanced diplomats, interested in creating “environmental peace” between our body and the external environment.
Research has clearly shown that your brain and central nervous system guide the way it responds to potential threats to your health.  Together, the brain and central nervous system detect and appropriately respond to anything that becomes a threat to you.
In short, the nervous system (brain and spinal cord) regulates innate immune responses through the release of neurotransmitters, neuropeptides and neurohormones. As long as your nervous system is firing on all cylinders, your immune system has the capacity to handle many infections it comes across.
The immune system is actually a sensory system itself, constantly providing information to the brain about what is occurring in your body (or its external environment), and the brain responds with an appropriate response.     
What does this all mean?
It means that we know your brain and immune system communicate and work together to launch an effective and appropriate immune response.
We also know that when your spine is not moving properly, it changes the way your brain can sense what is going on in an around your body, influencing how it actually controls the body.   
This suggests that a well-adjusted, optimally functioning spine could have an impact on your immune function!
How cool is that?