New! Sign up for our free email newsletter.
Science News
from research organizations

Not-so-dirty birds? Not enough evidence to link wild birds to food-borne illness

Date:
January 31, 2020
Source:
Washington State University
Summary:
Despite the perception that wild birds in farm fields can cause food-borne illness, a new study has found little evidence linking birds to E. coli, Salmonella and Campylobacter outbreaks.
Share:
FULL STORY

When food makes people sick, some blame birds because they hang around farms, and their feces can contain E. coli, Salmonella and Campylobacter, three common pathogens that can cause food-borne illness.

But a recent Washington State University study published in Biological Reviews on Jan. 31 has found scant evidence to support the link between wild birds and human illness involving those three pathogens.

The perceived risk of wild birds can impact their survival, said Olivia Smith, lead author on the study and a recent WSU Ph.D. graduate.

"Farmers are being encouraged to remove wild bird habitat to make their food safer, but it doesn't appear that these actions are based on data," Smith said. "When you restrict birds from agricultural settings, you are doing something that can lead to their decline."

Bird populations have been falling rapidly in recent decades. Scientists estimate that since 1970, North America has lost more than three billion birds. In light of this, the WSU researchers highlighted the need for more definitive research before destroying habitat and banning birds from fields in the name of food safety.

Smith and her colleagues, WSU Associate Professor Jeb Owen and Professor William Snyder, analyzed data for E. coli, Salmonella and Campylobacter in 431 North American breeding bird species and found no relevant studies for 65% of those species, including birds that are commonly found in farm fields such as raptors, great blue herons and black-billed magpies.

In their review, the researchers found only one study definitively linking wild birds to food-borne illness outbreaks: a case where sandhill cranes spread Campylobacter on fresh peas in an outbreak that sickened nearly 100 people in Alaska in 2008.

The most studied birds in relation to these pathogens were ducks, geese as well as two non-native species house sparrows and European starlings that tend to swarm on feed lots and can contaminate the food and water used for cattle. Yet there's a huge gap in knowledge about many other common native species that are often around agricultural crops including American robins.

Only 3% of the studies that the researchers analyzed looked at the entire transmission process from bird to plant to human. The majority simply tested bird feces to see if the bacteria were present or not.

In order for the bacteria to make people sick, the bird needs to get pathogenic strains of E. coli, Salmonella or Campylobacter on a food crop, and that bacteria has to survive long enough until people eat the contaminated food, including through shipment, washing, food processing in plants and food preparation. The data on the pathogen survival is also very limited.

"Birds do carry bacteria that can make people sick, but from our review of the scientific studies, it's unclear how big of a risk they are," Smith said.


Story Source:

Materials provided by Washington State University. Original written by Sara Zaske. Note: Content may be edited for style and length.


Journal Reference:

  1. Olivia M. Smith, William E. Snyder, Jeb P. Owen. Are we overestimating risk of enteric pathogen spillover from wild birds to humans? Biological Reviews, 2020; DOI: 10.1111/brv.12581

Cite This Page:

Washington State University. "Not-so-dirty birds? Not enough evidence to link wild birds to food-borne illness." ScienceDaily. ScienceDaily, 31 January 2020. <www.sciencedaily.com/releases/2020/01/200131114727.htm>.
Washington State University. (2020, January 31). Not-so-dirty birds? Not enough evidence to link wild birds to food-borne illness. ScienceDaily. Retrieved July 22, 2024 from www.sciencedaily.com/releases/2020/01/200131114727.htm
Washington State University. "Not-so-dirty birds? Not enough evidence to link wild birds to food-borne illness." ScienceDaily. www.sciencedaily.com/releases/2020/01/200131114727.htm (accessed July 22, 2024).

Explore More

from ScienceDaily

RELATED STORIES