Enterohemorrhagic Escherichia Coli Epidemiology

Enterohemorrhagic E. coli (EHEC) are the pathogenic subgroup of shiga toxin-producing E. coli (STEC). Acute hemorrhagic colitis has been associated mainly with the O157:H7 serotype. This serotype has been responsible for larger outbreaks of infection, has higher rates of complications, and appears to be more pathogenic than non-

EHEC STEC strains. The spectrum of disease associated with E. coli 0157:H7 includes bloody diarrhea, which is seen in as many as 95% of patients, nonbloody diarrhea, HUS, and thrombotic thrombocytopenic purpura.

Approximately 70,000 cases of EHEC illness occur every year in the United States. The highest incidence is in patients aged 5 to 9 years and 50 to 59 years. Outbreaks of diarrhea due to E. coli O157:H7 and other STECs have occurred from contaminated beef, classically hamburgers served at fast-food chains, unpasteurized milk and other dairy products, vegetables (e.g., alfalfa sprouts, coleslaw, and lettuce), and apple juice. The most important reservoir for E. coli O157:H7 is the GI tract of cattle. Person-to-person transmission is also possible because of the low infectious dose required. Swimming in infant pools or contaminated lakes or drinking municipal water also appears to be a risk factor. The incidence of diagnosed E. coli O157:H7 infec tions in the United States are greater among rural than urban populations, and E. coli O157:H7 infections occur in summer and autumn.

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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