The interior of a car is a microscopic zoo of germs and bacteria.

Your car’s cupholders might make you sick. It’s not just surfaces like germ-laden toilet seats and TV remotes that can make us ill, the interior of any car is a gruesome microscopic zoo of germs and bacteria waiting to pounce.

You might never want to drive again without wearing protective gloves, recent research suggests.

“People would be horrified at the thought of eating off their toilet seat, but few realise that eating off their car dashboard or console is just as likely to make them sick,” says the head of a British study of in-car hygiene.

And in the US, a spokesman for Ford, which has been researching the subject with the University of Michigan, says: “Vehicle cabins are exposed to a wide variety of environmental conditions that can make them microbial breeding grounds.”

Researchers found that high mileage made things worse. That taupe upholstery might literally make you vomit. Apart from interiors just gathering gunk with age, air and heater filters are likely to have stopped working properly, letting through airborne microbes.

Children and pets are most at risk from dirty cars, the scientists concluded. However, cars that regularly transport kids and pets were found to have the highest bacteria counts.

Microbiologists at Aston University in Birmingham studying in-car hygiene found harmful bacteria like E coli, salmonella and campylobacter, all of which can cause illness and can be fatal.

Each has the capability to survive for a month inside the car on surfaces such as the steering wheel, gear lever or dashboard.


In all, the scientists found 283 kinds of bacteria per square centimetre in the average car. Extreme cases had 850 types of bacteria per square centimetre.

The gear lever was the most heavily infected part of the passenger area with 356 microbes per square centimetre. However, another study, by scientists at London’s Queen Mary University, found the car boot was the filthiest area.

Other hot spots: car mats, the driver’s seat, between the seats, and air conditioning vents.

Don’t just blame kids and dogs. About a quarter of those surveyed admitted that food wrappers and empty drink bottles littered their car. One in six said they regularly left or dropped bits of food.

Bacillus cereus – a bug that can cause food poisoning and is found in rice, pasta, potatoes and pies – was commonly found by researchers.

At least half the respondents said the level of cleanliness in their cars left “a lot of room” for improvement and that they would never allow their home to be so filthy.

It seems that motorists have twigged to the menace of mobile micro-organisms.

Market research suggests that Americans alone spend more than $2 billion (R17.8bn) a year on stuff to freshen their cars, including aerosols, plug-ins, slow-release and hanger products that dangle from mirrors.

The trouble with the aftermarket barf-busters is that some drivers and passengers are sensitive to chemicals or don’t like artificial scents.

So researchers are looking for ways to stop making people sick without the solution also making them sick.

“Our findings suggest car interiors are complex ecosystems that house trillions of micro-organisms interacting with each other, with humans, and with their environment,” said Blaise Boles, an assistant professor in the University of Michigan’s department of molecular, cellular and developmental biology. -New Zealand Herald