Table 2. Description of the parameters used for the malaria basic reproductive number model.
Description | Formula and calculation | |
---|---|---|
ma | Number of mosquito bites per person/day | Average number of mosquitoes collected per person/day during the adult mosquito sampling study |
a | Frequency of the vector mosquito feeding on a person/day | a = C/x |
C | Proportion of mosquitoes feeding on human blood instead of other animals | 1/3 proportion fed on human for An. maculatus s.l. and An. minimus s.l. [47] 2/3 proportion fed on human for An. dirus s.l. |
x | Gonotrophic cycle length, measured by the interval between blood meals taken | 2.35 days for An. maculatus s.l. [47, 48] Two days for rainy season and three days for dry season for An. minimus s.l.[49] Three days for An. dirus s.l. [23, 50] |
b | Proportion of female mosquitoes developing parasites after taking an infective blood meal | Dependent on genetic and non-genetic determinants [51, 52], conservative estimate of 0.5 for all [53] |
p | Daily survival probability of adult mosquitoes | A1/X |
A | Average proportion of parous mosquitoes | Proportion parous from the mosquito survival data |
n | Development days of parasite in mosquito (sporogonic cycle) using Moshkovsky's method | For P. falciparum the thermal sum required to complete parasite development is 111°C above 16°C. For P. vivax the thermal sum required to complete parasite development is 105°C above 14.5°C [54] Average Tdry in study area = 23.2 °C Average Train in study area = 23.3 °C |
r | Rate of human recovery (1/number of days) | 60 days, so 1/60 [55, 56] |