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Parasites are found all over the world and there are many different types. However, they are often overlooked due to their small size. Parasites rely on hosts to survive. Hosts are organisms that are needed for completing the parasite’s life cycle. Therefore, parasites are constantly moving from one animal to another. How does this transmission between animals happen? We study how a parasite called Cardiocephaloides longicollis moves between animals and enters into their fish host. This parasite infects fish through their skin, to eventually develop in their brains. By visualizing C. longicollis with a fluorescent and glowing stain, we observed that its favorite entry portals into fish were areas close to the brain or with an easy connection to it, such as the eyes, the gills, or the back and belly areas. Our study helps us to understand one of the strategies that some parasites use to complete their life cycles.

Which Way to the Brain? A Parasite’s Favorite Entry Portals Into Fish