Yaneer Bar-Yam, a complexity scientist and one of the founders of the World Health Network, summarized what the science now says about COVID infections, whether they appear mild or severe. Every infection increases the risk for heart attacks, strokes and heart disease; for new-onset diabetes; for cognitive decline and dementia; for deregulating the immune system; and for reactivating viruses like Epstein-Barr or shingles. An epidemic of shingles, for example, is now afflicting young Chinese adults who have just recovered from a bout with COVID.