Crows are known to be reservoirs for Campylobacter jejuni, a bacterium that can cause gastrointestinal illness in humans. Studies have shown that crows can carry and shed large numbers of C. jejuni in their feces, and that these feces can contaminate the environment and potentially spread the bacteria to other animals and humans.

One study, conducted by researchers at the University of California, Davis, found that crows were the most likely of several bird species studied to carry C. jejuni. The study also found that the prevalence of C. jejuni in crows varied depending on the season, with the highest prevalence occurring during the summer months.

Another study, conducted by researchers at the Centers for Disease Control and Prevention (CDC), found that C. jejuni strains isolated from crows were genetically similar to strains that had caused illness in humans. This suggests that crows could be a potential source of C. jejuni infection for humans.

While crows are known to carry C. jejuni, it is not clear how often they transmit the bacteria to humans. More research is needed to determine the risk of Campylobacter jejuni infection from crows and to develop strategies to reduce this risk.

To reduce the risk of Campylobacter jejuni infection from crows, it is important to take precautions such as:

1) Avoiding contact with crow feces.

2) Washing your hands thoroughly with soap and water after handling anything that may have come into contact with crow feces.

3) Cooking poultry and other meats thoroughly to kill any Campylobacter bacteria that may be present.

4) Avoiding eating raw or undercooked eggs or milk.