TDS is a good enough reason for me. Looks like we came off the tier 3 lockdown. Our big surge was before and around Thanksgiving. The big surge after Thanksgiving didn't happen. We've been mostly trending downward.
There is a tendency to talk about the immune system as if it’s some magical process that can be explained only with metaphors like muscles and strengthening them through exercise. But there’s no magic involved here.
For the lungs and their response to the virus it’s an individual cell thing, not magic. Nearly all of the activity of the virus is on the air side, not the blood side, of all of the cells that make up the lungs. Those cells have little spike proteins on their surface, and so do the virus particles. The virus floats around inside the lung in the air and bumps into the lung cells and is ensnared by the compatibility of their respective spike proteins.
Once ensnared the normal motion of breathing rubs the virus spikes against the cell membrane and it eventually abrades an opening and breathing motion moves the virus inside the cell where its RNA strand replaces that of the cell and causes the cell to make some more viruses. Probably a hundred or so. Those, inside the cell, abrade the membrane of the cell and get out. After many of these, that cell will die and be replaced. All of those viruses that found their way out float around inside the lung and ensnare another cell and redo the process, unless exhalation throws it out of the body before it can do any further harm.
The virus does not “attack” the cell. It just floats around randomly in the air within the lung and bumps into things. Antibodies are produced in response to noticing these dead lung cells accumulating and coat the exterior membrane of the lung cell and prevent the original ensnarng process.
Perhaps the most informative perspective is the size differential. The virus is much smaller than a lung cell. The lung cell over a thousand times larger. That’s why the virus can abrade openings in the cell membrane without killing that cell right away.
There’s nothing strong or weak about these individual events. The antibodies covering the membrane and preventing attachment could do so in too thick totals and prevent air from being processed by the cell, which is its normal function.
When thinking about the process in a systematic way, errors in perspective evolve if you don’t think about what’s happening at the individual cell level.