Nosema apis is a microsporidian parasite that infects honeybees, specifically targeting their digestive system. It can lead to a disease known as nosemosis, which affects the bees' ability to digest food and absorb nutrients. Infected bees may show symptoms like reduced lifespan, poor foraging behavior, and decreased colony strength. The transmission of Nosema apis occurs through spores found in contaminated food or feces. This parasite can thrive in crowded conditions, making it a significant concern for beekeepers. Effective management practices, such as maintaining hive cleanliness and monitoring bee health, are essential to control its spread and impact on honeybee populations.