Table 1 Distributions and mathematical equations used to estimate parameters in the calculation of the basic reproductive number (R0) for DENV, CHIKV and ZIKV.
From: Estimating the risk of Dengue, Chikungunya and Zika outbreaks in a large European city
Parameter | Description | Virus | Specification | Value | Reference |
|---|---|---|---|---|---|
m | Mosquito mortality rate (1 /m = average mosquito life-span in days) | Dengue | Function | 2(0.031 + 95820e(T - 50.4)) | Manica et al. 2017 |
Chikungunya | Function | 2(0.031 + 95820e(T - 50.4)) | Manica et al. 2017 | ||
Zika | Function | 2(0.031 + 95820e(T - 50.4)) | Manica et al. 2017 | ||
χ H | Susceptibility to infection of humans, transmission efficiency from an infected mosquito to human | Dengue | Uniform | Min = 0.56; Max = 0.67 | Vega-Rua et al. 2013 |
Chikungunya | Uniform | Min = 0.14; Max = 0.84 | Vega-Rua et al. 2013 | ||
Zika | Uniform | Min = 0.19; Max = 0.39 | Di Luca et al. 2016 | ||
χ H | Susceptibility to infection of mosquito, transmission efficiency from an infected human to mosquito | Dengue | Uniform | Min = 0.14; Max = 0.39 | Talbalaghi et al. 2010 |
Chikungunya | Uniform | Min = 0.75; Max = 0.90 | Talbalaghi et al. 2010 | ||
Zika | Uniform | Min = 0.03; Max = 0.17 | Di Luca et al. 2016 | ||
1/ωV | Length of extrinsic incubation period (days) | Dengue | LogNormal | Mean = 2.9–0.08 T, SD = sqrt(1/4.9) | Chan & Johansson 2012 |
Chikungunya | Uniform | Min = 2; Max = 3) | Dubrulle et al. 2009 | ||
Zika | Uniform | Min = 7; Max = 14) | Guzzetta 2016 et al. 2016 | ||
1/γ | Infectious period in human hosts (days) | Dengue | Uniform | Min = 2; Max = 7 [Accessed 2017/02/27] | |
Chikungunya | Uniform | Min = 2; Max = 6 [Accessed 2017/02/27] | https://wwwnc.cdc.gov/travel/yellowbook/2016/infectious-diseases-related-to-travel/chikungunya | ||
Zika | Uniform | Min = 4; Max = 7 | Guzzetta et al. 2016 | ||
k | Biting rate | 0.09 | Uniform | Min = 0.08; Max = 0.1 | Manica et al. 2017 |
Reporting rate | Dengue | 22% | Shepard et al. 2014 | ||
Chikungunya | 54% | Moro et al. 2010 | |||
Zika | 10% | Zhang et al. 2017 | |||
Symptomatic rate | Dengue | 24% | Shepard et al. 2014 | ||
Chikungunya | 84% | Moro et al. 2010 | |||
Zika | 20% | Zhang et al. 2017 | |||
T | Mean Temperature | — | Mean and SD from air temperature in Rome 2003–2014 (°C) | Meteorological weather station “Roma sud” Hydrographic Service of Regione Lazio (http://www.idrografico.roma.it/annali). | |
V/H | Vector to host ratio | — | Set according to different scenario | This work |
