Food poisoning: when the whole family is ill, who do you take in first

Most food poisoning settles by itself in a day or two. But three situations cannot wait: nothing staying down, blood in the stool, and signs in the eyes and muscles — the last of which few people connect with food at all. This article is written for the situation where a household eats one meal and several people fall ill.

Is this really food poisoning

The most reliable sign is not in the symptoms but in the pattern: several people ate the same meal and all became ill within a similar window. Three people vomiting after the same lunch is almost certainly the food.

According to CDC, the time from eating to the first symptoms varies with the germ involved: some cause vomiting within a few hours, others take one to three days. So the most recent meal is not necessarily the meal that caused it.

• Vomiting, nausea, cramping abdominal pain, frequent stools, loose or completely watery.
• Fever, chills, aching all over.
• Tiredness, dizziness on standing, little and dark urine: signs of dehydration.
• Blood or bloody mucus in the stool: always needs to be seen, never kept under observation at home.

The commonest confusion: only ONE person has abdominal pain, the pain settles into the lower right side and keeps increasing — that points towards appendicitis and needs to be seen.

What to do right away

• Give small sips continuously, preferring oral rehydration salts mixed exactly as directed on the packet. How to mix them has its own article on this site, in Vietnamese.
• Write it down: which meal, what time, who ate what, who became ill and when, how many episodes of vomiting and diarrhoea, the last time they passed urine — these are exactly the first questions a doctor asks.
• Keep what is left of the food together with the container and the label, in the fridge — many cases are only traced because of it.
• Anyone vomiting or with diarrhoea should not cook for the household, even once they feel better.
• Let the person rest lying down, turned onto their side if they are still vomiting a lot or are drowsy.
• Several people ill after a meal for a crowd: report it to the local health service. According to CDC, reporting early helps stop further cases from the same source.

What not to do

• Do not take anti-diarrhoeal medicine on your own while there is fever or blood in the stool: it keeps the germ in the gut. The name you will see most often is loperamide — whether to use it is for a doctor or pharmacist to decide.
• Do not buy antibiotics yourself. Most cases do not need them, and with the germs that cause bloody diarrhoea, antibiotics raise the risk of a serious complication in children.
• Do not put fingers down the throat to force vomiting, and do not use folk antidotes such as strong lemon juice, mung bean water or raw egg white.

The whole family is ill: who do you take in first

Families usually take the person vomiting the most in first. That is not the right order: how bad the symptoms look does not reflect the risk.

1. Anyone with a sign from the red-flag box below — before everyone else.
2. Young children and infants: they lose fluid far faster than adults, and the signs are harder to see.
3. Older adults, particularly anyone taking diuretics, heart medication or diabetes medication.
4. Pregnant women: some germs carried in food harm the pregnancy even when the mother feels only mildly unwell.
5. People with kidney, heart or liver disease or diabetes, anyone having cancer treatment, and anyone taking medicines that suppress the immune system.

The rest — mild symptoms, still able to drink, still passing urine normally — can be watched at home, provided someone checks on them again during the day.

Signs in the eyes and muscles: the group most often missed

There is a form of food poisoning that shows itself as muscle weakness rather than vomiting and diarrhoea, caused by botulinum toxin — usually from canned goods, pâté, Vietnamese pork roll, meat or fish fermented in sealed containers, pickled bamboo shoots in tightly closed jars, and home vacuum-packed food. According to CDC, it is rare but can be fatal, and the antitoxin works better the earlier it is given.

• Double vision, blurred vision, a drooping eyelid.
• Difficulty speaking, a changed voice, difficulty swallowing or frequent choking, a dry mouth.
• Muscle weakness spreading from the top down: beginning in the face and neck, then the arms, then the legs.
• Usually no fever, and there may be no vomiting and no diarrhoea.
• Difficulty breathing, shallow breathing: this is already critical.

Any of the signs above after eating those foods: go to emergency care now, and say clearly what was eaten and when. A tin that is bulging, dented, leaking or has a lid that has popped goes in the bin — do not taste it.

When you must go to hospital

Party food, and leftovers kept overnight

• Food cooked ahead for a party, a wedding or a death anniversary meal often sits on the table for a few hours. According to CDC, perishable food should not be left at room temperature for more than two hours; in hot weather that comes down to one hour.
• Reheating until piping hot kills bacteria but does not destroy the toxin they produced while the dish stood cooling in the open air — left out overnight, it can still make people ill after reheating.
• Rice and sticky rice left to cool for a long time are the most overlooked source of all; divide them into small portions and refrigerate them early.

If several people in the household are ill and you are not sure who to take in first, Y Te Xanh (GreenCare) doctors and nurses can advise you on a remote video consultation, or come to the house and assess each person's fluid loss. If any of the signs in the box above is present, go to hospital first and call afterwards.

This article passes on the recommendations of a public health authority — source: the US CDC — and does not replace being examined in person. Citing CDC here does not imply that CDC endorses Y Te Xanh or our services.

Need personalised advice for your loved one? Call our hotline 094 368 81 15 (24/7) — calling to ask a question or to book costs nothing. GreenCare has doctors who come to examine, nurses who carry out doctor's orders (injections, infusions, dressing changes), remote consultation by video call, and a review of the medicines you are taking; an in-depth remote consultation, or any one after the first, is a paid service. For children we take examination and acute care only — not long-term care at home, and not newborns or expectant mothers. We confirm we have staff in your area and provide transparent pricing before we begin.