More than one intracellular bacteria and virus can infect the same cell, including immune cells, with both consuming and competing for energy made by the cell. The capsule surrounding the virus disappears inside the cell, leaving viral RNA; and the virus re-reforms a capsule with intracellular proteins, to evolve back into an infectious form that spreads in the body. Intracellular bacteria reproduce by cell division, spreading more and weaker infected cells. As infected cells die, abnormal proteins and cell debris are dispersed in the body. Whether by intention, as a matter of survival, or by random chance, intracellular bacterial and viral pathogens can attach to each other, spread together, and work together to exaggerate the adverse impact on health in any acute or chronic illness.
Intracellular pathogens can have a predilection for particular tissue and organs, depending on the pathogen and route by which the pathogen was acquired. Covid-19 patients develop lung, heart, kidney, cognitive, and other organ complications; and in fatal cases may develop DIC and/or a cytokine storm. Which complications occur in covid-19, and how severe the complications, may be related to the underlying chronic infections, where in the body the infections persisted, and how long the infections persisted. Older patients are more likely to have acquired more chronic infections, and had the infections longer; however, young patients can also have chronic infections, including chronic infections acquired in utero, in childhood, or from regrettable behaviors as a young adult.
Einstein said physics and quantum physics should be the same, yet medical science says they are different. In “Spillover”, intracellular pathogens were analogized to other animal predators, only intracellular pathogens attack from the inside. Maybe the difference in physics and quantum physics is intracellular pathogens change how cells function, which impacts how bodily functions work, move, and interact.