A simulation model of African Anopheles ecology and population dynamics for the analysis of malaria transmission.
BACKGROUND
Malaria is one of the oldest and deadliest infectious diseases in humans. Many mathematical models of malaria have been developed during the past century, and applied to potential interventions. However, malaria remains uncontrolled and is increasing in many areas, as are vector and parasite resistance to insecticides and drugs.


METHODS
This study presents a simulation model of African malaria vectors. This individual-based model incorporates current knowledge of the mechanisms underlying Anopheles population dynamics and their relations to the environment. One of its main strengths is that it is based on both biological and environmental variables.


RESULTS
The model made it possible to structure existing knowledge, assembled in a comprehensive review of the literature, and also pointed out important aspects of basic Anopheles biology about which knowledge is lacking. One simulation showed several patterns similar to those seen in the field, and made it possible to examine different analyses and hypotheses for these patterns; sensitivity analyses on temperature, moisture, predation and preliminary investigations of nutrient competition were also conducted.


CONCLUSIONS
Although based on some mathematical formulae and parameters, this new tool has been developed in order to be as explicit as possible, transparent in use, close to reality and amenable to direct use by field workers. It allows a better understanding of the mechanisms underlying Anopheles population dynamics in general and also a better understanding of the dynamics in specific local geographic environments. It points out many important areas for new investigations that will be critical to effective, efficient, sustainable interventions.
Fogarty International Center, National Institutes of Health, 16 Center Drive, Bethesda MD 20892, USA. depinayj@mail.nih.gov
Jean-Marc O
JM
Depinay
Charles M
CM
Mbogo
Gerry
G
Killeen
Bart
B
Knols
John
J
Beier
John
J
Carlson
Jonathan
J
Dushoff
Peter
P
Billingsley
Henry
H
Mwambi
John
J
Githure
Abdoulaye M
AM
Toure
F Ellis
FE
McKenzie
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D000852:Anopheles / Q000254:growth & development / Q000502:physiology*; D003198:Computer Simulation; D005247:Feeding Behavior; D005260:Female; D005298:Fertility; D005618:Fresh Water; D006801:Humans; D007303:Insect Vectors / Q000254:growth & development / Q000502:physiology*; D008018:Life Cycle Stages; D008288:Malaria / Q000635:transmission*; D008954:Models, Biological; D009068:Movement; D010058:Oviposition; D011156:Population Density; D011157:Population Dynamics; D013696:Temperature