E. coli O157:H7 Outbreak Response for Senior Living Facilities

Immediate Response & Case Isolation (First 4 Hours)

Upon notification of suspected E. coli O157:H7 cases (bloody diarrhea, abdominal cramps, fever), immediately isolate affected residents in separate areas with dedicated staff and bathroom facilities. Alert your infection prevention team and facility medical director to review symptoms against CDC case definitions and assess need for hospital referral—seniors with severe illness or signs of HUS (decreased urination, pallor, fatigue) require emergency transport. Notify your state health department or local health officer within 24 hours as required by state reportable disease laws; most states mandate immediate reporting for confirmed O157:H7 cases. Begin documenting symptom onset dates, meal times, and food sources for all affected residents to support epidemiological investigation.

Food Supply Investigation & Vendor Coordination

Immediately pull and quarantine all food from 72 hours before the first case's symptom onset—E. coli O157:H7 has a typical incubation period of 3–4 days. Work with your food service director to trace specific items (produce, meat, dairy) back to suppliers, focusing on high-risk sources like ground beef, raw vegetables, and unpasteurized products. Contact your vendors and suppliers with the contamination timeline; major suppliers maintain traceability systems and can cross-reference your facility's orders against FDA or FSIS recalls. Do not discard evidence foods without health department approval—they may be needed for laboratory testing. Request that your health department coordinate with FDA and FSIS to determine if a broader supply-chain recall is underway.

Staff Communication, Testing & Documentation

Inform all staff who handled food preparation, served meals, or provided care during the exposure window; provide clear written guidance on hand hygiene, symptom monitoring, and reporting requirements. Encourage symptomatic staff to undergo stool testing through occupational health—some jurisdictions require healthcare facility workers with confirmed O157:H7 to be excluded from work until two consecutive negative cultures are documented. Document all outbreak response actions in writing: facility notification logs, health department communication records, food traceability forms, staff training attendance, and resident/family notification letters. Maintain compliance with state health department outbreak reporting forms and provide regular updates until the investigation closes—health departments typically require follow-up cultures from affected residents 48+ hours after symptom resolution to verify clearance.

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