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Hookworm infection is endemic in developing countries, leading to poor cognitive function—among other disruptions. In this study, the effects of  Nippostrongylus brasiliensis  infection (a murine model of  Necator Americanus ) on cognitive function were investigated. Though impaired cognition has been extensively reported, the exact domain of cognition affected is still unknown, hence requiring investigation. The objective of this study was to identify possible cognitive changes during  Nippostrongylus brasiliensis  infection in mice, using the Morris water maze. Here, we show for the first time that mice infected with  Nippostrongylus brasiliensis  were able to learn the Morris water maze task, but demonstrated impaired reference memory. Anxiety measured by thigmotaxis in the maze, did not play a role for the observed cognitive impairment. Of further interest, an increase in the number of hippocampal macrophages and microglia with training and/or infection suggested a significant role of these cell types during spatial learning. Together, these experimental mouse studies suggest that helminth infections do have an impact on cognition. Further experimental animal studies on cognition and infection might open new approaches for a better understanding and impact of pathogen infections.

Nippostrongylus brasiliensis infection leads to impaired reference memory and myeloid cell interference