Apiary Biosecurity: Notifiable Disease Network Map (2D)

Biosecurity Controls

Hive hygiene level 55%

Inspection frequency 10 d

Notification delay 2 d

Quarantine radius 2 hops

Simulation speed 2.0×

Outbreak Status

Day 0No quarantine

Healthy

Infected (AFB)

Culled

NBU notified

How this differs from the 3D lab

Instead of spatial drift particles in a 3D scene, this model treats the apiary as an explicit contact graph: every hive is a node, and an edge exists between any two hives close enough for drifting or robbing bees to travel between them. Disease risk flows along edges, weighted by inverse distance.

Hive hygiene — lowers the per-edge transmission probability each simulated day.
Inspection frequency — how often each hive is checked for AFB signs; a positive check moves it to "detected" and starts the notification clock.
Notification delay — the real statutory lag between a beekeeper reporting suspected AFB and the National Bee Unit's Bee Diseases Order restriction zone actually taking effect. Nothing is contained until this clock runs out, so disease keeps spreading along the graph during the delay.
Quarantine radius — once notification lands, every hive within this many graph-hops of a confirmed case is locked down (edges to it are cut), not just a fixed physical circle.

The chart below tracks healthy, infected and culled counts over time so you can see the outbreak curve — and how a longer notification delay lets the curve climb higher before containment bends it back down.

Healthy Detected / inspected Infected (AFB) Culled & destroyed

Healthy Infected Culled