Asymptomatic Plasmodium falciparum infections may not be shortened by acquired immunity

Malaria Journal

Table 2 Raw parameter estimates: force of infection and detectability

Survival model	FOI by season (person^-1 year^-1)						Detectability		AIC
Survival model	\(\lambda _1\)	\(\lambda _2\)	\(\lambda _3\)	\(\lambda _4\)	\(\lambda _5\)	\(\lambda _6\)	\(q_0\)	\(q_1\) (2-months^-1)
Weibull	74.5	41.6	36.3	13.2	22.7	56.9	−0.72	−0.003727	7,908.5
Gamma	169.1	93.5	89.2	9.1	57.1	126.3	−0.84	−0.004692	7,944.8
Lognormal	41.7	26.0	21.6	7.5	15.1	38.8	−0.89	−0.004985	7,978.3
Exponential	45.1	19.3	18.1	7.4	12.3	39.8	−0.84	−0.002865	8,022.6

Separate FOI parameters (\(\lambda _1, \lambda _2, \ldots, \lambda _6\)) were estimated for each of the six 2-month seasons. For a host of given age a (in units of two months) the detectability can be calculated as \(q(a)=\text{ logit }^{-1}(q_0 + q_1(a-120.72))\). Lower AIC values indicate a better fit to the data.

ISSN: 1475-2875