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Hidden germs like Salmonella, Listeria, E. coli, plus mold and yeast are lurking in your kitchen and have the potential to make you and your family very sick if you don’t know where to look.

Cheryl Luptowski, a Home Safety Expert at the National Sanitation Foundation International (NSF International) said: “People think that the bathroom is the dirtiest place in their house. When in fact the kitchen has the most germs.”

Cheryl Lupotowski and University of Arizona-Tucson Professor and Microbiologist Dr. Charles Gerba (AKA Dr. Germ) reveal the 10 dirtiest spots in the average home kitchen, plus expert advice on how to banish germs.

1. Sponges and Dishcloths
Microbe: E. coli
According to a study by the NSF, more than 75% of dish sponges and rags have some sort of coliform bacteria–a family of bacteria that includes Salmonella and E. coli and is an indicator of potential fecal contamination.
EXPERT ADVICE: Microwaving your sponges and dishcloths on high for about 30 seconds will kill most bacteria, according to Dr. Germ.

2. Sink
Microbe: E. coli
You may think that this is one of cleanest spots because everything gets washed in the sink. 45% of kitchen sinks were found to have coliform bacteria.
EXPERT ADVICE: Dr. Germ advises disinfecting the sink with a kitchen cleaner and just to be safe, don’t apply the 10 second rule when you drop food in the sink.

3. Refrigerator Vegetable Compartment
Microbes: Salmonella, Listeria, yeast and mold
“Dark moist environments tend to breed germs, even in the refrigerator. Produce should always be stored on a separate shelf above meat, poultry and seafood to avoid raw juices dripping onto the produce. First, avoid cross-contamination by separating ready-to-eat and unwashed produce. Also, keep them separate in your grocery cart, during food preparation, and when using kitchen tools and appliances,” said Cheryl Luptowski.

Hidden germs like Salmonella, Listeria, E. coli, plus mold and yeast are lurking in your kitchen

Hidden germs like Salmonella, Listeria, E. coli, plus mold and yeast are lurking in your kitchen

EXPERT ADVICE: To effectively clean the compartment, first remove the drawer from the refrigerator if possible. Cheryl Lupotowski advises washing the bin using a clean sponge or soft cloth and a mild detergent mixed with warm water. Rinse with tap water and wipe dry with a paper towel. To help control odors, use warm water mixed with a baking soda solution (about 1-2 tablespoons of baking soda to 1 quart of water). Rinse and wipe dry.

4. Refrigerator Meat Compartment
Microbes: Salmonella, E. coli, yeast and mold
This is another dark moist environment that’s a breeding ground for bacteria. Store meat and seafood on a separate shelf below produce to avoid raw juices from dripping onto the produce.
EXPERT ADVICE: “Clean monthly the same way you clean the vegetable compartment and whenever you see any spilled meat juices,” says Cheryl Lupotowski.

5. Cutting Board
Microbe: E. coli
In a study by the NSF, 18% of cutting boards were found to have coliform bacteria.
EXPERT ADVICE: Dr. Germ recommends using separate cutting boards: one for produce and one for meat, seafood, and poultry to avoid cross-contamination. Wash each one in hot soapy water and dry with a paper towel since bacteria thrive in moist environments.

6. Blender Gasket
Microbes: Salmonella, E. coli, yeast and mold
“Appliances and utensils that are not properly disassembled and cleaned can harbor microorganisms,” says Cheryl Luptowski.

EXPERT ADVICE: “To clean properly, completely disassemble the blender, removing the jar, lid, plus the blade and gasket at the bottom and place them all in the dishwasher after each use. If the pieces are not dishwasher safe, hand them thoroughly in hot soapy water, then rinse and dry before re-assembling,” says Cheryl Lupotwoski.

7. Kitchen Countertops
Microbe: E. coli
32% of kitchen countertops were found to have coliform bacteria, according to an NSF study.
EXPERT ADVICE: Wiping down countertops with dirty sponges and dishcloths increases the chance that this area will be a germ hot spot in your kitchen. Break out the kitchen disinfectant again and use disposable paper towels to clean up this area.

8. Can Opener
Microbes: Salmonella, E. coli, yeast and mold
Simply rinsing this tool isn’t enough to safeguard it from germs because it comes into direct contact with food.
EXPERT ADVICE: “To effectively clean, place the can opener in the dishwasher after each use (if dishwasher safe). If hand washing, wash in hot soapy water, rinsing thoroughly with clean tap water before air drying after each use. If hand washing, pay special attention to the area around the cutting blades to be sure all food residue is removed,” says Cheryl Luptowski.

9. Rubber Spatula
Microbes: E. coli, yeast and mold
For two-piece spatulas, it’s important to separate the handle from the spatula portion before cleaning.
EXPERT ADVICE: “If they are dishwasher safe, place both sections in the machine after each use. If hand washing, wash in hot soapy water, rinsing thoroughly with clean water. For one-piece spatulas, hand wash it thoroughly in hot soapy water, paying special attention to the area where the handle joins the spatula. Rinse thoroughly and dry,” says Cheryl Luptowski.

10. Food Storage Container with Rubber Seal
Microbes: Salmonella, yeast and mold
Containers that have not been cleaned thoroughly have high counts of yeast and mold which may make food spoil quickly.
EXPERT ADVICE: “If dishwasher safe, place both the container and the lid in the dishwasher and wash after each use. If hand washing, wash both the container and lid in hot soapy water, paying special attention to the area around the seal as well as any grooves where the cover attaches to the container. Rinse thoroughly and allow to air dry,” says Cheryl Lupotowski.

Salmonella: “Within 8 to 12 hours after eating a contaminated food item, a person may develop abdominal pain and diarrhea, and sometimes nausea and vomiting. Symptoms generally last a day or less, but can be more serious in older or debilitated people,” says Cheryl Lupotowski.

Listeria: “Within 7 to 30 days after eating a contaminated food item, a person may develop symptoms including fever, headache, nausea and vomiting. Listeria primarily affects pregnant women and their fetuses, newborns, the elderly, people with cancer, and those with impaired immune systems. Can cause fetal and infant death,” says Cheryl Lupotowski.

E. coli: “Within 2 to 5 days after eating a contaminated food item, a person may develop severe diarrhea (possibly bloody) and abdominal cramps. Usually little or no fever is present, and the illness resolves in 5 to 10 days,” says Cheryl Lupotowski.

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A supermarket in Boston is going to sell only food that’s past its sell-by date.

In the US alone, 40% of food is thrown out, partly because of confusing date labels, telling consumers to “use by”, “sell by” and “enjoy by” a certain time.

Some of the dates are not about safety but taste, says Dana Gunders, a food scientist from the Natural Resources Defence Council (NRDC), which has issued a report saying much of the food labelled bad is actually perfectly edible.

At the beginning of next year, businessman Doug Rauch, once behind the successful Trader Joe’s chain in the US, is opening a supermarket and restaurant which will sell outdated food.

So what are some of those foods?

Tortilla chips aren't going to make you sick a month after its sell-by date

Tortilla chips aren’t going to make you sick a month after its sell-by date

Tortilla chips aren’t going to make you sick after a month, says Dana Gunders, although they might start tasting stale. Putting them in a toaster with oil will re-crisp them again, while storing in a sealed container extends their life by keeping moisture out. Dana Gunders says yogurt can last beyond six weeks and she often scrapes off the mould.

“I eat yogurt months past its date, I haven’t ever had a problem.”

Chocolate can last a long time, Dana Gunders adds, but it often develops a white coating, known as the “bloom”, when it’s exposed to the air. This happens when some of the crystalline fat melts and rises to the top. It’s not mould, she says, and it’s fine to eat.

People throw out eggs much earlier than they need to, says Dama Gunders – they can last 3-5 weeks. Keep them at a temperature below 5C (41F), says Ted Labuza, a professor of food science at the University of Minnesota, because that helps prevent potential growth of Salmonella enteritidis.

Milk will smell or taste bad long before it makes you sick, says Ted Labuza. Don’t let the container sit out at room temperature because microbes in the air will spoil the milk – close it up quickly and return it to the refrigerator, which should be set at around 36F (2C) to help prolong the life of milk.