Category Archives: Giardia

Research – Giardia: The most common intestinal parasite found in humans in the US

Outbreak News Today 


Giardiasis is a diarrheal illness caused by the parasite Giardia intestinalis (also known as Giardia lamblia or Giardia duodenalis). It is the most common intestinal parasite found in humans in the United States.

Globally, it infects nearly 2% of adults and 6% to 8% of children in developed countries and nearly 33% of people in developing countries have had giardiasis.

USA – Colorado officials investigate Cryptosporidium, Giardia cases and possible link to Water World

Outbreak News Today 

Images CDC

The Colorado state and Tri-County health departments are investigating whether illness is linked to a June 11-13 incident at Water World, during which untreated pond water might have contaminated pools and drinking fountains or might have been used to make food, ice and drinks at the park.

Two people who visited Water World during that time have been diagnosed with Crypto, and one person has been diagnosed with Giardia. Public health agencies are investigating whether these illnesses are associated with their visits to Water World.

Water World resolved the water contamination issue, and there does not appear to be ongoing contamination.

Canada – Research -Parasites in Retail Leafy Greens

CTV News220px-Cyclospora_cayetanensis_stained

In the first-ever large-scale study of its kind, Canadian researchers have  tested how clean pre-washed packages of leafy greens really are, and found  parasites in dozens of samples purchased in Ontario.

Looking at 544 samples of store-bought, pre-washed salads, researchers from  Health Canada and the Public Health Agency of Canada found nearly one-tenth of  the samples were contaminated with either cyclospora, cryptosporidium or giardia  — parasites that can cause intestinal illness, such as diarrhea.

“In the present study, a relatively high prevalence of all three parasites  was found in packaged, ready-to-eat leafy greens,” said the study, published  recently in the Journal of Food Protection.

To conduct the study, the research team purchased a total of 544 prewashed  salad samples between April 2009 and March 2010 — all in the Waterloo, Ont.  area. After testing the samples, the team found:

  • Nine (1.7%) of the samples tested positive for cyclospora;
  • 32 (5.7%) of the samples tested positive for cryptosporidium;
  • 10 (1.8%) of the samples tested positive for giardia.


Research New Bacterial Identification Technology

Food Poisoning Bulletin

xTAG Gastrointestinal Pathogen Panel (GPP), which recently received approval from US Food and Drug Administration (FDA), is one lab test that can do the job of many,  expertly scanning a solitary stool sample for 11 different illness-inducing organisms.

To many, that sounds an impressive feat in an of itself. But considering that 179 million Americans are stricken with gastroenteritis every year, according to the Centers for Disease Control and Prevention (CDC), it’s also one that can come in handy. Infectious gastroenteritis is caused by certain viruses, bacteria, or parasites and can be spread easily through person-to-person contact or from contaminated food, water, and surfaces. Symptoms include vomiting and diarrhea.

The  xTAG can scan for  bacteria including Campylobacter, Clostridium difficile (C. difficile) toxin A/B, Escherichia coli (E. coli) O157, Enterotoxigenic Escherichia coli (ETEC) LT/ST, Salmonella, Shigella and Shiga‐like Toxin producing E. coli (STEC) stx 1/stx 2. It can scan for viruses including Norovirus and Rotavirus A. And it can scan for parasites such as Cryptosporidium and Giardia.

HPS – Norovirus – Rotavirus- Cryptosporidium and Giardia Report 2011


The Health Protection Agency Scotlan (HPA) has released its 2011 report into the incidence of viral and protozoal reported infections 2011.

There were 1668 laboratory reports of Norovirus (NV) to HPS in 2011, a marked decrease of 1441 (46.3%) on 2010 when there were 3109 reports.

There were 1465 laboratory reports of Rotavirus to HPS in 2011, a decrease of 326 (18.2%) compared to 2010 when there were 1791 reports.

A total of 442 isolates of Cryptosporidium sp. were reported to HPS in 2011. This compares with 584 in 2010, a statistically significant decrease of 24%.

A total of 194 isolates of Giardia sp. were reported to HPS in 2011.