Abstract
Physical avoidance of pathogens is a crucial defense strategy used by the host to reduce pathogen infection. Hosts display the use of multiple strategies to sense and avoid pathogens, ranging from olfaction to sensing of damage caused by pathogen infection. Understanding various mechanisms of pathogen avoidance has the potential to uncover conserved host defense responses that are important against pathogen infections. Here, we describe protocols for studying pathogen lawn avoidance behavior as well as a change of bacterial preferences in the model nematode Caenorhabditis elegans. Besides, we describe the protocol for measuring preferences for pathogenic and nonpathogenic bacteria after training of the animals on pathogenic bacteria. These assays can be implemented in discovering various mechanisms of host learning that result in the avoidance of pathogens.
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