[MCN] Today's kids likely to be exposed to greater malaria risk than we've known

Lance Olsen lance at wildrockies.org
Thu Jun 27 16:11:47 EDT 2019

Biology Letters  Published  26 June 2019
https://doi.org/10.1098/rsbl.2019.0275 <https://doi.org/10.1098/rsbl.2019.0275>

Exploring the lower thermal limits for development of the human malaria parasite, Plasmodium falciparum

Jessica L. Waite <https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275#>, Eunho Suh <https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275#>, Penelope A. Lynch <https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275#> and Matthew B. Thomas <https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275#>

Abstract [ Open access ]

https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275 <https://royalsocietypublishing.org/doi/10.1098/rsbl.2019.0275>

The rate of malaria transmission is strongly determined by parasite development time in the mosquito, known as the extrinsic incubation period (EIP), since the quicker parasites develop, the greater the chance that the vector will survive long enough for the parasite to complete development and be transmitted. EIP is known to be temperature-dependent but this relationship is surprisingly poorly characterized. There is a single degree-day model for EIP of Plasmodium falciparum that derives from a limited number of poorly controlled studies conducted almost a century ago. Here, we show that the established degree-day model greatly underestimates the rate of development of P. falciparum in both Anopheles stephensi and An. gambiae mosquitoes at temperatures in the range of 17–20°C. We also show that realistic daily temperature fluctuation further speeds parasite development. These novel results challenge one of the longest standing models in malaria biology and have potentially important implications for understanding the impacts of future climate change.


“The gap between high- and low-income families has widened steadily since about 1980, hitting a new high every year since 1985. “

Business Week, November 21, 1994, p. 72.

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