Experimental determination of the force of malaria infection reveals a non-linear relationship to mosquito sporozoite loads

Plasmodium sporozoites are the infective stage of the malaria parasite. Though this is a bottleneck for the parasite, the quantitative dynamics of transmission, from mosquito inoculation of sporozoites to patent blood-stage infection in the mammalian host, are poorly understood. Here we utilize a ro...

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Veröffentlicht in:PLoS pathogens 2020-05, Vol.16 (5), p.e1008181-e1008181
Hauptverfasser: Aleshnick, Maya, Ganusov, Vitaly V, Nasir, Gibran, Yenokyan, Gayane, Sinnis, Photini
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creator Aleshnick, Maya
Ganusov, Vitaly V
Nasir, Gibran
Yenokyan, Gayane
Sinnis, Photini
description Plasmodium sporozoites are the infective stage of the malaria parasite. Though this is a bottleneck for the parasite, the quantitative dynamics of transmission, from mosquito inoculation of sporozoites to patent blood-stage infection in the mammalian host, are poorly understood. Here we utilize a rodent model to determine the probability of malaria infection after infectious mosquito bite, and consider the impact of mosquito parasite load, blood-meal acquisition, probe-time, and probe location, on infection probability. We found that infection likelihood correlates with mosquito sporozoite load and, to a lesser degree, the duration of probing, and is not dependent upon the mosquito's ability to find blood. The relationship between sporozoite load and infection probability is non-linear and can be described by a set of models that include a threshold, with mosquitoes harboring over 10,000 salivary gland sporozoites being significantly more likely to initiate a malaria infection. Overall, our data suggest that the small subset of highly infected mosquitoes may contribute disproportionally to malaria transmission in the field and that quantifying mosquito sporozoite loads could aid in predicting the force of infection in different transmission settings.
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subjects Animals
Anopheles - metabolism
Anopheles - parasitology
Biology and Life Sciences
Blood
Culicidae
Disease transmission
Experiments
Feeding Behavior
Female
Health aspects
Immunology
Infections
Infective stages
Inoculation
Malaria
Malaria - parasitology
Malaria - transmission
Medicine and Health Sciences
Mice
Mosquito Vectors - metabolism
Mosquitoes
Parasites
Physiological aspects
Plasmodium - metabolism
Plasmodium - pathogenicity
Plasmodium yoelii - metabolism
Plasmodium yoelii - pathogenicity
Regression analysis
Salivary gland
Salivary glands
Salivary Glands - parasitology
Sporozoites
Sporozoites - metabolism
Sporozoites - physiology
Vector-borne diseases
title Experimental determination of the force of malaria infection reveals a non-linear relationship to mosquito sporozoite loads
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