Mario Monteiro

Prof Monteiro
Phone number: 
519-824-4120 ext. 53447
MACN 333
MACN 230/346

Education and Employment Background

Prof. Mario A. Monteiro received his PhD from York University in 1996. He went on to work as a Postdoctoral Fellow in the Canadian Bacterial Diseases Network, a Research Associate for the National Research Council, and a Senior Research Scientist for Wyeth Pharmaceuticals. He joined the University of Guelph in the Department of Chemistry in 2003, where he is now a Full Professor.

Research Themes

Prof. Monteiro’s is a polysaccharide chemist whose research is focused on carbohydrate-based vaccines. With a growing threat of antibiotic resistance, research on vaccines is critical. Carbohydrate-based vaccines are relatively unexplored because it involves complex chemistry. Monteiro is dedicated to finding untried remedies for serious diseases caused by bacteria. Key research themes include:

  1. Evaluating a polysaccharide vaccine against the colorectal cancer pathogen. Fusobacterium nucleatum is a bacterium that has recently been described to have an unknown role in the development of colorectal cancer. Monteiro examined the structure of this bacterium and discovered a polysaccharide on the outer surface, which provided insight into disease mechanisms that could be applied to new vaccines.
  2. Vaccine for Traveler’s Diarrhea. Campylobacter jejuni is a major cause of bacterial diarrhea. Monteiro and his team have developed a vaccine that has been shown to be effective in mice and nonhuman primates, and to some degree in humans.
  3. Clostridioides difficile vaccine. C. difficile is a gastrointestinal bug that can cause diarrhea and weakened immune systems. Monteiro and his team are exploring vaccines that target carbohydrates on the bug’s surface, which could help address the threat of C. difficile.
  4. Autism-associated gut bacteria. There is some evidence that the gut bacteria Clostridium bolteae may produce toxins that are associated with autism symptoms. This bacterium has been found in higher numbers in the gastrointestinal tracts of autistic children. Monteiro and his team are working to develop a vaccine that targets C. Bolteae. If the bacteria are eliminated, it may help improve the other symptoms of autism.
  5. Middle-ear infection vaccine. Alloiococcus otitidis is a bacterium that has been linked to middle ear infections. Middle ear infections are one of the most serious ailments for children. Monteiro and his team are working towards developing a vaccine to treat this bacterium.


  • Editorial Review Board, Vaccines, 2017
  • University of Guelph’s 150 Innovations Project, 2017
  • Top 25 Immigrant Award, Canadian Immigrant Magazine/Royal Bank of Canada, 2017
  • Innovation of the Year, University of Guelph, 2015
  • Top 50 Most Influential People in Vaccines, Vaccine Nation/World Vaccine Congress

Media Coverage

Vaccine Against Autism-Associated Bacterium

Clostridium difficile Vaccine

Campyobacter Vaccine

Vaccine against bacteria associated with traveler’s diarrhea

Tuberculosis Vaccine

Awards and Accolades

General Research