Skip to main content

v0.9.0

Released 2026-05-27 · GitHub Release

Overview​

  • Add fixed_rate vaccination rollout
  • Add an optional coverage cap to each vaccination campaign

Simulations​

POST /api/v1/simulations

New rollout strategy: fixed_rate​

Each campaign's rollout block now accepts a new type fixed_rate, in addition to flat_count:

"rollout": {
  "type": "fixed_rate",
  "rate": 0.005
}

Inside the campaign window this is identical to a spontaneous transition at rate: every individual in a source compartment (restricted to target_age_groups) has a per-day probability of 1 - exp(-rate * dt) of moving to the target.

See the Campaigns guide for the worked example and the fixed_rate playground template for a V-SEIHR setup.

New per-campaign coverage cap​

Each campaign now accepts an optional coverage block that stops the campaign once cumulative coverage reaches a target fraction of the initial population in target_age_groups:

"coverage": {
  "fraction": 0.7,
  "compartments": ["Susceptible_vax", "Exposed_vax", "Infected_vax", "Recovered_vax"]
}

Once the summed current occupancy of compartments, restricted to the campaign's target_age_groups, reaches fraction * initial_population, the campaign stops contributing to the rate. The cap composes with both flat_count and fixed_rate, and is independent per campaign.

See the Coverage cap section of the Campaigns guide for details and validation rules.

Playground​

  • New V-SEIHR (fixed-rate vaccination) template.

Documentation​

  • New "Fixed rate (per-day hazard)" and "Coverage cap" sections in the Campaigns guide.