What to take for food poisioning

Food can become contaminated at any stage during its production, processing or cooking.

For example, it can become contaminated by:

• not cooking food thoroughly (particularly meat)
• not correctly storing food that needs to be chilled at below 5C
• keeping cooked food unrefrigerated for a long period
• eating food that has been touched by someone who is ill or has been in contact with someone with diarrhoea and vomiting
• cross-contamination (where harmful bacteria are spread between food, surfaces and equipment)

Cross-contamination can occur, for example, if you prepare raw chicken on a chopping board and don't wash the board before preparing food that won't be cooked (such as salad), as the harmful bacteria can be spread from the chopping board to the salad.

It can also occur if raw meat is stored above ready-to-eat meals and juices from the meat drip on to the food below.

See preventing food poisoning for information about reducing these risks

Types of infection

Food contamination is usually caused by bacteria, but it can also sometimes be caused by viruses or parasites. Some of the main sources of contamination are described below.

Campylobacter

In the UK, campylobacter bacteria are the most common cause of food poisoning. The bacteria are usually found on raw or undercooked meat (particularly poultry), unpasteurised milk and untreated water.

The incubation period (the time between eating contaminated food and the start of symptoms) for food poisoning caused by campylobacter is usually between two and five days. The symptoms usually last less than a week.

Salmonella

Salmonella bacteria are often found in raw or undercooked meat, raw eggs, milk, and other dairy products.

The incubation period is usually between 12 and 72 hours. The symptoms usually last around four to seven days.

Listeria

Listeria bacteria may be found in a range of chilled, "ready-to-eat" foods, including pre-packed sandwiches, cooked sliced meats and pâté, and soft cheeses (such as Brie or Camembert).

All of these foods should be eaten by their "use-by" dates. This is particularly important for pregnant women, because a listeria infection (known as listeriosis) in pregnancy can cause pregnancy and birth complications, and can result in miscarriage.

The incubation period can vary considerably, from a few days to several weeks. The symptoms will usually pass within three days.

Escherichia coli (E. coli)

Escherichia coli, often known as E. coli, are bacteria found in the digestive systems of many animals, including humans. Most strains are harmless but some can cause serious illness.

Most cases of E. coli food poisoning occur after eating undercooked beef (particularly mince, burgers and meatballs) or drinking unpasteurised milk.

The incubation period for food poisoning caused by E. coli is typically one to eight days. The symptoms usually last for a few days or weeks.

Shigella

Shigella bacteria can contaminate any food that has been washed in contaminated water.

Symptoms typically develop within seven days of eating contaminated food and last for up to a week.

An infection caused by Shigella bacteria is known as bacillary dysentery or shigellosis. See the topic on dysentery for more information about it.

Viruses

The virus that most commonly causes diarrhoea and vomiting is the norovirus. It's easily spread from person to person, through contaminated food or water. Raw shellfish, particularly oysters, can also be a source of infection.

The incubation period typically lasts 24-48 hours and the symptoms usually pass in a couple of days.

In young children, the rotavirus is a common cause of infection from contaminated food. The symptoms usually develop within a week and pass in around five to seven days.

Parasites

In the UK, food poisoning caused by parasites is rare. It's much more common in the developing world.

Parasitic infections that can be spread in contaminated food include:

• giardiasis – an infection caused by a parasite called Giardia intestinalis
• cryptosporidiosis – an infection caused by a parasite called Cryptosporidium
• ameobiasis – a type of dysentery caused by a single-cell parasite (ameoba) called Entamoeba histolytica (this is very rare in the UK)

The symptoms of food poisoning caused by a parasite usually develop within 10 days of eating contaminated food, although sometimes it may be weeks before you feel unwell.

If left untreated, the symptoms can last a long time – sometimes several weeks or even a few months.

After you swallow an unsafe (contaminated) food or drink, it may take hours or days to develop symptoms. If you have symptoms of food poisoning, such as diarrhea or vomiting, drink plenty of fluids to prevent dehydration (not having enough water in your body).

When to See a Doctor for Food Poisoning

See your doctor or healthcare provider if you have symptoms that are severe, including:

• Bloody diarrhea
• High fever (temperature over 102°F, measured in your mouth)
• Frequent vomiting that prevents keeping liquids down (which can lead to dehydration)
• Signs of dehydration, including little or no urination, a very dry mouth and throat, or feeling dizzy when standing up
• Diarrhea that lasts more than 3 days

Serious Health Problems and Long-Term Effects From Food Poisoning

Most people have only mild illnesses, lasting a few hours to several days. However, some people need to be hospitalized, and some illnesses cause long-term health problems or even death. Infections spread by food can lead to:

• Chronic arthritis
• Brain and nerve damage
• Kidney failure caused by hemolytic uremic syndrome (HUS)

Some germs make you sick within a few hours after you swallow them. Others may take a few days to make you sick. This list provides the symptoms, when symptoms begin, and common food sources for germs that cause food poisoning. The germs are listed in order of how quickly symptoms begin.

• Symptoms begin 30 minutes to 8 hours after exposure: Nausea, vomiting, stomach cramps. Most people also have diarrhea.
• Common food sources: Foods that are not cooked after handling, such as sliced meats, puddings, pastries, and sandwiches

• Symptoms begin 2 to 48 hours after exposure: Watery diarrhea, nausea, stomach cramps, vomiting, fever, chills
• Common food sources: Raw or undercooked shellfish, particularly oysters

• Symptoms begin 6 to 24 hours after exposure: Diarrhea, stomach cramps. Usually begins suddenly and lasts for less than 24 hours. Vomiting and fever are not common.
• Common food sources: Beef or poultry, especially large roasts; gravies; dried or precooked foods

• Symptoms begin 12 to 48 hours after exposure: Diarrhea, nausea/stomach pain, vomiting
• Common food sources: Leafy greens, fresh fruits, shellfish (such as oysters), or unsafe water
  Other sources: Infected person; touching surfaces that have the virus on them

• Symptoms begin 18 to 36 hours after exposure: Double or blurred vision, drooping eyelids, slurred speech. Difficulty swallowing and breathing, dry mouth. Muscle weakness and paralysis. Symptoms start in the head and move down as the illness gets worse.
• Common food sources: Improperly canned or fermented foods, usually homemade. Prison-made illicit alcohol (pruno).

• Symptoms begin 3 to 4 days after exposure: Severe stomach cramps, diarrhea (often bloody), and vomiting. Around 5­­–10% of people diagnosed with E. coli develop a life-threatening health problem.
• Common food sources: Raw or undercooked ground beef, raw (unpasteurized) milk and juice, raw vegetables (such as lettuce), raw sprouts, unsafe water

• Symptoms begin 1 week after exposure: Watery diarrhea, loss of appetite, and weight loss. Stomach cramps/pain, bloating, increased gas, nausea, and fatigue.
• Common food sources: Raw fruits or vegetables and herbs

• Symptoms usually begin within 2 weeks after exposure: Pregnant women usually have a fever and other flu-like symptoms, such as fatigue and muscle aches. Infections during pregnancy can lead to serious illness or even death in newborns. Other people (most often older adults): headache, stiff neck, confusion, loss of balance, and convulsions in addition to fever and muscle aches.
• Common food sources: Queso fresco and other soft cheeses, raw sprouts, melons, hot dogs, pâtés, deli meats, smoked seafood, and raw (unpasteurized) milk