Honey bee workers collect pollen and nectar from a variety of flowering plants to use as a food source. Honey bees typically forage from up to 1-2 miles away from the hive, though sometimes they travel even further, including up to 10 miles away. However, much of the modern landscape consists of agricultural fields, which limits the foraging options for honey bees in these areas.

Honey bees that guard hive entrances are twice as likely to allow in trespassers from other hives if the intruders are infected with the Israeli acute paralysis virus, a deadly pathogen of bees, researchers report.

Their new study, reported in the Proceedings of the National Academy of Sciences, strongly suggests that IAPV infection alters honey bees’ behavior and physiology in ways that boost the virus’s ability to spread, the researchers say.