is part of the Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them. Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

  • American Agriculturist
  • Beef Producer
  • Corn and Soybean Digest
  • Dakota Farmer
  • Delta Farm Press
  • Farm Futures
  • Farm Industry news
  • Indiana Prairie Farmer
  • Kansas Farmer
  • Michigan Farmer
  • Missouri Ruralist
  • Nebraska Farmer
  • Ohio Farmer
  • Prairie Farmer
  • Southeast Farm Press
  • Southwest Farm Press
  • The Farmer
  • Wallaces Farmer
  • Western Farm Press
  • Western Farmer Stockman
  • Wisconsin Agriculturist

Microbes strengthen animals' protozoa

In an animal research “first,≵ disease-causing bacteria have been found to gain strength from interaction with single-celled organisms called protozoa that are naturally present inside animals.

This finding suggests that the protozoa in animals' digestive tracts may be a place where dangerous bacteria can lurk and develop.

In studies at the Agricultural Research Service (ARS) National Animal Disease Center (NADC) in Ames, Iowa, veterinary medical officer Steven Carlson and microbiologist Mark Rasmussen discovered that an antibiotic-resistant strain of Salmonella becomes especially virulent when tucked inside protozoa in the rumen, or first stomach, of cattle.

Until now, protozoa had never been thought of as reservoirs of disease in animals, according to Rasmussen.

The researchers set out to study the relationship between rumen protozoa and Salmonella's virulence and resistance to antibiotics. They focused on an S. enterica strain named DT104 that's a foodborne pathogen believed to be more virulent than its antibiotic-sensitive counterparts.

In animals, salmonellosis is usually a diarrheal disease that the animals recover from without requiring antimicrobial therapy. But antibiotics are needed when severe diarrhea or systemic infections occur. Unfortunately, many Salmonella strains have become resistant to many antibiotics, according to Carlson.

Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.