Where is the real bacterial gathering place in the home?
Where is the real bacterial gathering place in the home?
In our home, there is always a sanitation corner that is neglected by people. So which of these sanitation corners that people have neglected is the real bacterial gathering place? Recently, some readers have called the hotline in this column, hoping to ask experts to test the home environment and see where the bacteria are most likely to breed. To this end, the reporter collected nine samples that were considered by the readers to be sanitary corners to the Beijing Academy of Agricultural Sciences, and the experiment was conducted by Associate Professor Yan Wenke. It was found that toothbrushes, dish cloths, chopping boards, and cotton slippers were breeding in the home environment. A hotbed of bacteria. The soft hair of the toothbrush is a hiding place for bacteria, and its bacteria content is even dozens or more of the toilet lid.
doubt
Where is the dirtest at home?
"The dirtiest place in my house should be a quilt." Reader Ms. Li told reporters that her family's quilts have been in use for five years. Two years ago, she cleaned the cotton in the quilt with washing powder. I didn't expect to have a musty smell recently.
In the interview, some people thought that the cotton slippers worn on the feet were the dirtiest. "I bought a pair of cotton slippers last winter. When the day is warm, I will use it in a plastic bag and I plan to use it again this winter." What the reader did not think of was that he opened the plastic bag and stinked. The taste is straightforward. It turned out that because of the trouble, Mr. Zhao has not cleaned cotton slippers.
Ms. Zhang is very diligent and her house is very clean. "I think the dirtiest part of the house should be under the toilet ring, because it is not very clean."
experiment
Sampling→diluting→cultivation
1. The reporter applies the sterile cotton swab soaked in sterile saline to the place to be tested: the toilet cover, the toilet seat, the place where the dust accumulates under the bed, the chopping board for cutting vegetables, and the surface of the door handle. The area applied is 10 cm square. The cotton swab was placed in a swab containing 5.5 ml of sterile physiological saline for 80 times while the sample was labeled. In addition, among the items to be tested, there are two years of unwashed quilts, one month of cotton slippers, six months of dish cloth and toothbrushes.
2. After sampling, Prof. Yan injected 0.2 ml of the diluted sample from each of the 9 samples into the solid medium and labeled the sample name. The medium used this time was a common agar medium. Professor Yan then gently shakes the medium to allow the bacteria in the sample to fully contact the agar medium and attach to the entire surface of the medium.
3. Subsequently, Prof. Yan placed the medium with the nine sample dilutions into an electrothermal incubator for incubation. The temperature of the incubator was set at 30 ° C and the incubation time was 24 hours.
in conclusion
Cotton slippers are the most susceptible to bacteria
After 24 hours, Professor Yan took the 9 culture dishes out. All the results are surprising. Among the samples with the same dilution, the number of bacterial colonies cultured from the dust under the bed was only 39, and the most was slippers, reaching 329. The quilt is less than expected by the core, only 31.
Bacteria favorite toothbrush
Among the nine samples, the most cultivated colonies were not the toilet seat or toilet lid that people envisioned, but a toothbrush. On the agar culture dish, thousands of colonies are scattered, and the types of these bacteria are mainly yeasts and molds.
The bacterial colonies extracted under the toilet lid and the toilet seat are pitiful compared to those densely populated bacterial colonies extracted from the toothbrush. "That's because the materials used in toilets generally have a certain antibacterial property. It is difficult for bacteria to adhere to them, not to mention the growth and reproduction there, so the chance of bacterial growth is reduced. Instead, the toothbrush is not replaced for a long time. In addition, the environment is humid, giving the bacteria breeding machine." Professor Yan said.
The place where food is in contact is the dirtiest
The two samples obtained from the kitchen were not optimistic. The dirtiest was the dish cloth. The bacterial colonies extracted from the cutting board were not as much as the dish cloth, but the number reached 565.
analysis
Why is the toothbrush dirty than the toilet lid?
Feng Xiaochi, deputy director of the Department of Stomatology, Peking University Hospital, said that the oral cavity itself is a bacterial environment, food residues in the mouth, soft dirt, etc., are all "culture media" for bacterial reproduction. In addition to toothpaste, toothbrush soft hair may also contain food residue, soft dirt, etc., so it is easier to breed bacteria. Dr. Feng said that the bacteria on the toothbrush in the experiment are not likely to be pathogenic bacteria. Therefore, although the number of colonies is large, it generally does not affect the human body. He said that most of the bacteria that cause oral diseases such as periodontitis are anaerobic bacteria, not molds or yeasts that have been cultured, so you don't have to worry about it. But Dr. Feng reminded everyone that the toothbrush should be disinfected or replaced in a timely manner.
Don't ignore the dust under the bed
Chi Chunhua, chief physician of the Department of Respiratory Medicine, Peking University Hospital, said that the dust under the indoor bed is a very fine particle, which may enter the human mouth and nasal cavity as well as the lower respiratory tract, which is irritating. Wang Aiping, chief physician of Peking University's dermatology department, said that although the total number of colonies in the cotton slippers sample is large, it is a conditional disease, and wearing cotton slippers will not get sick. She said that drying is not conducive to the growth of bacteria and fungi, so things like quilts and cotton slippers need to be exposed to the sun.
Rank sample name number of colonies
1 toothbrush thousands
2 thousands of dishwashing cloths
3 chopping board for cutting vegetables
4 slippers
Dust under 5 beds
6 quilt core
7 door handle
8 toilet cover
9 under the toilet seat
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