Milwaukee, WI – Many Wisconsin residents woke up sick on Black Friday after large Thanksgiving meals, and state health officials say food-poisoning risks tied to undercooked turkey and improperly handled leftovers may be behind a rise in stomach illness reports.

According to the Wisconsin Department of Health Services, the day after Thanksgiving routinely brings an increase in nausea, stomach cramps, diarrhea, and fatigue. While overeating can trigger discomfort, experts say improperly cooked poultry and food left out too long are the leading causes of post-holiday illness across the state.

Large turkeys, especially those commonly served at holiday gatherings, are difficult to cook evenly. The thickest sections of the bird—deep in the breast and thigh—often heat slowly and may not reach the required 165°F internal temperature, even when the outside appears fully done. Families trying to avoid a dry turkey often remove it early, unintentionally increasing exposure to bacteria such as Salmonella and Campylobacter, both frequently associated with undercooked poultry.

Improper leftover handling contributes significantly as well. Wisconsin’s Thanksgiving potlucks, buffet-style setups, and extended family gatherings often leave food sitting out at room temperature for hours. Once dishes remain in the “danger zone” between 40°F and 140°F for more than two hours, bacteria multiply rapidly. Organisms like Staphylococcus aureus and Bacillus cereus, both known to grow on food left out too long, can cause sudden vomiting and stomach discomfort.

Nutrition specialists recommend discarding questionable leftovers, reheating all foods to 165°F, and staying hydrated if symptoms develop. Residents experiencing severe vomiting, dehydration, high fever, or symptoms lasting more than 24 hours are encouraged to seek medical attention.

ADDITIONAL SAFETY TIPS

✓ Check leftovers: Discard anything left out for more than 2 hours.
✓ Reheat properly: Heat all leftovers to 165°F before eating.
✓ Watch for symptoms: Sudden nausea, cramps, or diarrhea may indicate bacterial illness.
✓ Cook turkey fully: Verify temperature at the thickest parts of the bird.
✓ Seek care when needed: High fever, dehydration, or blood in stool warrant medical attention.