Is soft serve ice cream safe during pregnancy?

What does the evidence say about soft serve ice cream during pregnancy?

1. Listeria persisted inside a single soft serve shake machine for roughly a year, from November 2014 to November 2015, and caused three illnesses despite intensive cleaning and at least two full disassemblies of the equipment. 1
2. In the 2015 ice cream outbreak, contamination levels averaged only about 620 bacterial cells per serving, and the four people who became severely ill were all older adults with conditions that compromised immune function. 2
3. Listeria grows at refrigeration temperatures around 4°C, unlike most foodborne bacteria, which is what lets it establish itself in chilled equipment rather than being held in check by the cold. 3
4. Cross-contamination after pasteurization is an under-modeled gap in dairy risk assessments, driven by the pathogen's ability to grow while chilled and to find damp niches in processing equipment. 4
5. Pregnant people are around 17 times more likely to develop listeriosis than the general population, and maternal illness is usually mild and flu-like even when the pregnancy consequences are serious. 5

Is soft serve ice cream safe in each trimester?

• First trimester. Cold and bland is often the only thing that works when nausea is bad, and soft serve fits that description perfectly. If you are going to have it, a high-turnover chain with automated cleaning cycles is a better bet than a machine at a seasonal stand.
• Second trimester. This is usually when cravings peak and soft serve becomes a regular stop. Nothing about it is off-limits. Choose places that look busy and clean, and be more cautious with milkshakes, which are mixed inside the same machine parts.
• Third trimester. The practical advice does not change. Do keep an eye on fever, chills, and muscle aches in the weeks after any higher-risk food, since listeriosis in pregnancy often looks like a mild flu rather than food poisoning.