Bonus
People may regain this trait in the SIS (“S-I-S”) model but not in the SIR (“S-I-R”) model. For 10 points each:
[10h] Identify this trait represented by the first namesake compartment of the SIR model. The effective reproduction number equals the basic reproduction number multiplied by the proportion of the population with this trait. A specific term is required.
ANSWER: susceptibility [accept word forms like susceptible; reject “uninfected” or “recovered”] (The SIR model is the Susceptible-Infectious-Recovered model and the SIS model is the Susceptible-Infectious-Susceptible model.)
[10e] This trait, contrasted with susceptibility, is conferred to the recovered population of the SIR model, preventing reinfection. Widespread vaccination can confer the “herd” form of this trait to a population.
ANSWER: immunity [accept herd immunity or community immunity or population immunity or mass immunity; accept word forms like immune]
[10m] Infectious diseases of this kind have a basic reproduction number of one if the entire population is susceptible. Infectious diseases of this kind, like the common cold, exist at a baseline level in the population.
ANSWER: endemic [reject “epidemic” or “pandemic”]
<Editors, Biology>
| Editions | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|
| 2 | 39 | 16.15 | 97% | 46% | 18% |
Conversion
Summary
| Tournament | Edition | Exact Match? | Heard | PPB | Easy % | Medium % | Hard % |
|---|---|---|---|---|---|---|---|
| UK (North) | UK | Y | 1 | 10.00 | 100% | 0% | 0% |
| UK (South) | UK | Y | 1 | 30.00 | 100% | 100% | 100% |
| Eastern Canada (2) | US | Y | 1 | 10.00 | 100% | 0% | 0% |
| Upper Mid-Atlantic | US | Y | 12 | 15.83 | 100% | 42% | 17% |
| Midwest | US | Y | 1 | 20.00 | 100% | 100% | 0% |
| Northeast | US | Y | 12 | 16.67 | 100% | 50% | 17% |
| Pacific | US | Y | 9 | 16.67 | 89% | 56% | 22% |
| Southeast | US | Y | 1 | 10.00 | 100% | 0% | 0% |
| Upstate NY | US | Y | 1 | 10.00 | 100% | 0% | 0% |