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Preventing cross contamination


Cross contamination is when harmful bacteria are accidentally transferred from raw food to ready-to-eat food.

Most cases of food poisoning are caused by bacteria from raw food coming into contact with food that is ready to eat. Follow these five rules to prevent it happening in your kitchen.

1. Wash your hands well after handling raw meat or poultry

Research done by safefood has turned up some startling evidence with regard to handwashing:

  • 80% of people didn't wash their hands thoroughly after handling raw mince
  • 84% didn't thoroughly wash their hands after handling raw chicken while preparing a warm chicken salad
  • 26% of people had raw meat bacteria on their hands after preparing food

Just think about where your hands have been and where and what they will touch.

2. Handle raw meat packaging just as carefully as the meat itself

Harmful bacteria such as E.coli can last on your food packaging for up to 24 hours. These bacteria can be transferred quite easily to other kitchen surfaces and also to hands and other kitchen surfaces such as worktops and press handles. Research by the Food Standards Authority of Ireland found that 13% of chicken packaging was contaminated with Campylobacter.

  • When you do your shopping, pack your raw meat and poultry separately from your ready-to-eat foods. If you use reusable bags, keep one bag for raw meats only.
  • Store your raw meat and poultry on the bottom shelf of your fridge below ready to eat foods.
  • Remove your raw meat and poultry from their packaging and directly place on to your cutting board or baking tray. Then throw the packaging straight in to the bin [sustainability flag]. By doing this you will help avoid contaminating any of your work surfaces.
  • After you have finished preparing your raw meat or poultry, wash down all surfaces with hot soapy water.

3. Don't assume that your work surfaces are bacteria free, just because they look clean

Bacteria like Campylobacter can last on kitchen surfaces for up to 1 hour and E.coli can last for up to 24 hours. safefood research found that:

  • 96% of kitchen surfaces were not thoroughly washed after food preparation.
  • 43% were contaminated with raw meat bacteria after food preparation.
  • A further 67% of people didn't wash the chopping board after using it to prepare raw chicken.
  • Of the chopping boards tested, 50% were contaminated with raw meat bacteria after preparation.

It's always good practice to wash worktops and cutting boards with hot soapy water after preparing foods, especially after preparing raw meat, poultry, seafood or raw vegetables. Always clean as you go between preparing these foods and especially when handling raw foods and then handling ready to eat foods.

4. Wash your kitchen utensils after each use 

The study done by safefood found that: 

  • 72% of people failed to thoroughly wash a knife that was used in preparing raw chicken before reusing it to cut salad vegetables.
  • 67% of people failed to thoroughly wash a knife that had been used to prepare raw beef  before cutting salad vegetables.
  • Of the knives that were tested, 18% were contaminated with Campylobacter and 5% were contaminated with E.coli.
  • A whopping 37% of the salads tested were contaminated with raw meat bacteria.

Scrub all kitchen utensils thoroughly in plenty of clean hot soapy water or in a dishwasher, particularly after using them to prepare raw meat or poultry.

5. Don't use dishcloths for more than two days in a row

Rinsing dishcloths under the tap does not remove germs. Dishcloths that are used for more than two days tend to have high levels of bacteria.

Food poisoning bacteria can survive and grow on dishcloths, particularly when the cloth is damp. Dishcloths are usually stored crumpled up, so they stay wet and often contain larger numbers of bacteria. Of the dishcloths tested in the safefood survey, E.coli was present on 27.5% and Listeria was present on 13.5% of them.

  • Change your dishcloth at least every other day.
  • If you use your dishcloth to wipe off 'high risk' food debris such as raw eggs, raw meat, raw poultry, raw fish or raw vegetables, change the cloth straight away.
  • Boiling your dishcloth for 15 minutes or washing it on a standard cycle in the washing machine are effective ways to kill any bacteria that might be present.
  • Don't use a dishcloth that smells.
  • If it looks dirty, it is very likely that a high number of bacteria are present.


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