Table 2.
Description of parameters.
| parameter | value | description |
|---|---|---|
| β | 1.5–2.5 × 10−5 | transmission parameter—corresponds to R0 = 1.5–2.5, w. one month duration and total population = 105 [11,12,16] |
| d | one month−1 | rate of clearance, corresponds to one month duration of carriage |
| u | 1/60 month−1 | entry/exit rate |
| a | 1.0–1.05 | transmission advantage of VT and recombinant strains |
| k | 0–0.5 | relative susceptibility of those already colonized (0 = no dual colonization) [17–21] |
| v | 0.5 | reduction of transmissibility of VT strain to vaccinated individuals [22] |
| f | 0.9 | fraction of new entrants into the population that are vaccinated |
| λV | aβ(IVS + IVV + 0.5(IVNS + IVNV + IVRS + IVRV) | force of infection with VT-R strain in unvaccinated and vaccinated populations, respectively |
| vaβ(IVS + IVV + 0.5(IVNS + IVNV + IVRS + IVRV) | ||
| λN | β(INS + INV + 0.5(IVNS + IVNV + INRS + INRV) | force of infection with NVT-S strain |
| λR | aβ(IRS + IRV + 0.5(IVRS + IVRV + INRS + INRV) | force of infection with NVT-R strain |