Bad news for people with type A blood who also love to eat at buffets: A new study spotted by Science News reveals that people with this particular blood type have a significantly higher risk of contracting severe diarrhea from a common bacterial pathogen.

Researchers at the Washington University School of Medicine discovered that a protein secreted by a strain of Escherichia coli latches onto sugar molecules that are only found within the blood cells and intestinal lining of people with type A blood.

For the study, 106 healthy volunteers drank water that contained a strain of the bacterium E. coli—one of the major causes of infectious diarrhea around the world. Only 56 percent of volunteers with blood types O and B contracted moderate to severe diarrhea, but 81 percent of volunteers with blood types A or AB fell ill. All participants were later given antibiotics.

Researchers say these findings, which were published in the Journal of Clinical Investigation, could aid the development of an effective vaccine. Developing parts of the world are particularly susceptible to E. coli contamination, which causes millions of infections and hundreds of thousands of deaths each year, researchers note.

As anyone who has ever had "Delhi belly" can attest, this is also a concern for people who travel to developing regions. The main causes of E. coli infection are contaminated food and water, so it's wise to regularly wash your hands and avoid eating raw produce and undercooked beef while traveling.

[h/t Science News]