Marissa K. Grossman's research while affiliated with William Penn University and other places
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Publications (13)
Insecticide-treated bed nets reduce malaria transmission by limiting contact between mosquito vectors and human hosts when mosquitoes feed during the night. However, malaria vectors can also feed in the early evening and in the morning when people are not protected. Here, we explored how the timing of blood feeding interacts with environmental temp...
Background:
There is substantial concern that the spread of insecticide resistance will render long-lasting insecticide-treated nets (LLINs) ineffective. However, there is limited evidence supporting a clear association between insecticide resistance and malaria incidence or prevalence in the field. We suggest that one reason for this disconnect i...
Mosquito‐borne diseases cause a major burden of disease worldwide. The vital rates of these ectothermic vectors and parasites respond strongly and nonlinearly to temperature and therefore to climate change. Here, we review how trait‐based approaches can synthesise and mechanistically predict the temperature dependence of transmission across vectors...
A number of studies report changes in the biting time of malaria mosquitoes following the introduction of long-lasting insecticide-treated bed nets (LLINs). Here, we explored whether timing of blood feeding interacts with environmental temperature to influence the vector competence of Anopheles mosquitoes for the human malaria parasite, Plasmodium...
Background
As resistance to insecticides increases in disease vectors, it has become exceedingly important to monitor populations for susceptibility. Most studies of field populations of Aedes aegypti have largely characterized resistance patterns at the spatial scale of the city or country, which may not be completely informative given that insect...
Insecticide resistance has evolved in disease vectors worldwide, creating the urgent need to either develop new control methods or restore insecticide susceptibility to regain use of existing tools. Here we show that phenotypic susceptibility can be restored in a highly resistant field-derived strain of Aedes aegypti in only 10 generations through...
Background:
Understanding mechanisms driving insecticide resistance in vector populations remains a public health priority. To date, most research has focused on the genetic mechanisms underpinning resistance, yet it is unclear what role environmental drivers may play in shaping phenotypic expression. One of the key environmental drivers of Aedes...
Citations
... This is increasingly less so in 30 Sub-Saharan Africa (SSA) with evidence that Anopheles spp. are shifting towards more 31 exophagic behaviour [17][18][19]. Furthermore, effectiveness of IRS depends on household 32 coverage of the study area, spray quality, and residual activity of the insecticide used. ...
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... Following a first threshold assay, intensity assays could be performed to determine survival at higher dosages, typically 5× and 10× the diagnostic concentration, to determine whether the resistance intensity is low, moderate, or high [5]. Such different levels of resistance intensity have been associated with the degree to which vector control tools such as long-lasting insecticidal nets (LLINs) are effective following multiple exposures [9]. However, in general, these assays are designed to establish the technical resistance of a population: to assess whether the population has changed their phenotypic response over time or space. ...
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... Mosquitoes, the vectors of life-threatening pathogens including dengue virus and malaria parasites, exhibit a complex life cycle consisting of aquatic (juvenile) and terrestrial (adult) stages. Consequently, mosquitoes are exposed to a wide range of 1 biotic (inter-and intra-specific competition, microbiome) and abiotic factors (temperature, rainfall, humidity) and are highly sensitive to environmental changes in their habitats (Deutsch et al. 2008;Mordecai et al. 2019). ...
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... Strong resistance to pyrethroids is not an uncommon occurrence in Ae. aegypti and has been shown to be widespread but also to be highly variable over small geographic distances (Estep et al. 2018, Grossman et al. 2019, Kandel et al. 2019, Mundis et al. 2020, Mack et al. 2021. We see the same in these few sites in Houston. ...
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... It has been shown in laboratory studies that phenotypic resistance to pyrethroids can be lost after several generations free of insecticide pressure. (69,70,71) Also, the Nacupay population showed the lower frequencies of the kdr alleles F1534C and I1016V. Nevertheless, results from the literature are inconsistent when analyzing the effect of colonization on the frequency of mutant kdr alleles. ...
... aegypti USDA. These differences could be explained by the testing methods, the size and volume of the chamber, larval rearing conditions, such as overcrowding or poor diet [50,51], the time of day for testing [52], a decrease in temperature [53], an increase in humidity during insecticide susceptibility testing, the natural plant diet of the adults [13], and the genotypic background of the inbred mosquito strain. It is crucial that these physical and environmental conditions be kept constant while carrying out the HITTS-TOX bioassay to minimize multiple potential sources of variability, which can influence the result of the bioassay. ...
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