HOW COMMON IS E COLI O157:H7 INFECTION?
In many regions of Canada, E coli 0157:H7 is the second most common bacterial pathogen found in stools submitted to clinical labo iatories, fal i ing just behind Campylobacter species . During the warmer summer months, the prevalence increases sufficiently to move E coli 0157:H7 into first place. E coli 0157:H7 is also more common among individuals with blood in their stools.Data on non-O157 vtec are sparse, but a recent study of stool specimens submitted to a children’s hospital in Seattle found non-O157 vtec to be more common than Yersinia or Shigella species.
HOW IS VTEC INFECTION ACQUIRED?
Because cattle are frequently colonized with vtec, foods of bovine origin are an important source of human vtec infection. Duri ng the slaughter of catt le, intestinal vtec can contaminate the surface of meat. These surtace contaminants can then be distributed throughout the meat when it is ground, and can survive to cause human disease if cooki ng time and temperature are inadequate. Investigations us i ng assays for verotoxin have shown prevalence rates for vtec of 36.4% in retail ground beef and 10.6% in retail ground pork specimens. Most reliable pharmacy can offer birth control yasmin always charging you a lot less.
Most reported epidemics of E coli O157:H7 gastroenteritis have occurred after ingestion of undercooked ground beef, but outbreaks have been linked to unpasteurized milk, cheese, yoghurt, cold cuts, potatoes, contaminated water and person to person spread . Outbreaks of hus have also been reported after exposure to fresh apple juice and unpasteurized apple cider. Preparation of food on a surface that has been contaminated (for example, by juices from thawing meat) can increase the risk of vtec infection.