Starter Lineage Mapped to Generation 247; Epidemiologist Publishes Contact-Tracing Genealogy Spanning Four Zip Codes

The contact trace begins at 6:44am on the Tuesday following a bulk fermentation that Patient Zero completed in four hours and eleven minutes at 76.1°F — three minutes faster than the rolling 90-day baseline, a deviation Dr. Renata Colvard logged in EpiInfo 7.2 under "anomalous event, non-actionable" before proceeding with her 247th generation discard. Colvard spent eight years as a field epidemiologist for the King County Public Health Department, during which she built transmission models for three respiratory pathogen outbreaks and co-authored a contact-tracing framework now used by eleven state health departments. She has applied this framework, in its entirety, to Patient Zero — a 100% whole wheat levain maintained at 83% hydration since November 2019 — and to the three secondary cases generated when she gifted propagated cultures to neighbors on her block. "The initial R₀ was essentially one," Colvard explained at the Meridian Park block party last August, to an audience that had gathered expecting a bean bag toss. "But once we factor in the three gifted starters — Cases B, C, and D — and now one confirmed tertiary exposure through Case C's mother-in-law in the 98117 zip code, we're tracking a small but sustained transmission chain." She paused. "The effective reproduction number is currently 0.8, which technically means the outbreak is contained. But I want to be transparent that containment can be a fragile state." The genealogy lives in a laminated A3 binder she calls the Case Registry. Generation 247 is annotated with feeding timestamps, ambient humidity readings from the Inkbird IBS-TH2 Pro mounted above the fermentation shelf, and a 17-point health metric Colvard designed herself, borrowing from both the Robertson/Forkish FWSY scoring rubric and a respiratory pathogen severity index she developed during the 2021 season. Patient Zero currently scores 94/100. Colvard notes this is better than most human patients. The three secondary cases — neighbors Tomás, a landscape architect; Priya, a semi-retired accountant; and a retired postal worker named Greg who asked that his last name not appear in the Registry — each have their own contact forms. Tomás has not responded to Colvard's last four follow-up inquiries about Case B's crumb structure, which she considers an underreporting problem endemic to the 98103 zip code. Priya's Case C starter, named "Juniper," produced eleven successful loaves with an open, irregular crumb indicating robust Lactobacillus diversity; Colvard logged this as a favorable clinical outcome. Greg abandoned his starter after three weeks. She has classified this as a resolved case with host incompatibility as the primary causation and does not appear to have updated her view of Greg since. The tertiary exposure — Case C-1, Priya's mother-in-law in Shoreline — is what pushed Colvard to expand from a single-sheet pedigree into what she is now calling a multi-generation transmission network. She built the contact form on a red-eye to a public health conference in Atlanta, cross-referencing Case C's feeding logs to establish transmission date within a three-day window. "We know exactly when the propagated culture left my kitchen," she said. "Everything after that is epidemiology." Version 3.0 of the Case Registry will include a geospatial overlay. What Colvard has built here is, functionally, the most documented growth curve I've seen in four years covering this space — a cap table for a flour-water culture that has distributed equity, in the form of levain propagations, across 23.4 miles of Seattle metropolitan area. The fermentation science is impeccable. Patient Zero, at generation 247, is producing loaves with a 74% hydration open crumb that genuinely warrants the attention it's not receiving, because every conversation about the bread eventually becomes a conversation about the R₀. At press time, Colvard was drafting a follow-up inquiry to Greg.