Revisiting the basic reproductive number for malaria and its implications for malaria control.

Abstract:

:The prospects for the success of malaria control depend, in part, on the basic reproductive number for malaria, R0. Here, we estimate R0 in a novel way for 121 African populations, and thereby increase the number of R0 estimates for malaria by an order of magnitude. The estimates range from around one to more than 3,000. We also consider malaria transmission and control in finite human populations, of size H. We show that classic formulas approximate the expected number of mosquitoes that could trace infection back to one mosquito after one parasite generation, Z0(H), but they overestimate the expected number of infected humans per infected human, R0(H). Heterogeneous biting increases R0 and, as we show, Z0(H), but we also show that it sometimes reduces R0(H); those who are bitten most both infect many vectors and absorb infectious bites. The large range of R0 estimates strongly supports the long-held notion that malaria control presents variable challenges across its transmission spectrum. In populations where R0 is highest, malaria control will require multiple, integrated methods that target those who are bitten most. Therefore, strategic planning for malaria control should consider R0, the spatial scale of transmission, human population density, and heterogeneous biting.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Smith DL,McKenzie FE,Snow RW,Hay SI

doi

10.1371/journal.pbio.0050042

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

e42

issue

3

eissn

1544-9173

issn

1545-7885

pii

06-PLBI-RA-0569R3

journal_volume

5

pub_type

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