Scientists from the University of Birmingham in the United Kingdom conducted a sampling survey on children's seats in private cars, and found that there were 100 kinds of bacteria threatening health per square centimeter. In contrast, there are only 50 kinds of bacteria per square centimeter in the family toilet, which is only half of the child safety seat. In addition, the number of bacteria detected in steering wheel, gear lever and back seat is 10 times that of toilet.
There is no doubt that the number of bacteria in the car far exceeds our imagination!
How many bacteria are there in the car?
Before answering this question, we may ask: How many bacteria are there on the earth?
A study published in the Proceedings of the National Academy of Sciences described in detail the proportion of biomass on the earth.
As the most important biological species on the earth, plants account for 82% of the total biomass of the earth, which is 7500 times that of human beings, while bacteria are second only to plants, accounting for 13% of the total biomass. Among them, the total weight of viruses is three times that of humans, while that of fungi is as high as 200 times.
Humans only account for 0.0 1% of the total biomass of the earth.
Because the quantity is too large, the unit used in this study is gigatons. One gigaton is about the weight of 2750 Empire State Buildings, and the proportion of human beings is 0.06 gigaton, which is about 165 Empire State Buildings, while the total amount of bacteria and viruses is about 193875 Empire State Buildings.
The total amount of bacteria is so huge, will there be less bacteria in the car?
China academy of sciences affiliated zhongke physics and chemistry environment analysis research center? , the main models of dozens of mainstream automobile brands (service life 1 year-15 years) were comprehensively tested and studied, including TVOC (total volatile organic compounds), inhalable particulate matter, total number of colonies and bacteria, and a report on automobile air quality inspection was released.
The report shows that the national standard is ≤ 1000 cfu/m2, but the actual result is 2 174.75? Cfu/㎡ (average), exceeding the standard by nearly 174.75%. Compared with the stricter Singapore standard, the measured air quality inside the car exceeds the standard by nearly 449.5%, while the Singapore landfill standard is only 2500? cfu/㎡.
Harm of bacteria to human body
Bacteria in the car mainly come from the environment, including drivers and passengers, and some of them come from the breeding of goods caused by poor sanitary conditions in the car. Bacteria in the car usually include Staphylococcus aureus, Escherichia coli, mold, Pseudomonas aeruginosa and Streptococcus pneumoniae.
According to the pathogenicity of bacteria, pathogenic bacteria can usually be divided into 10 grades, among which Staphylococcus aureus, Streptococcus pneumoniae and Streptococcus hemolyticus rank in the top three, which need our special attention.
Staphylococcus aureus, also known as Carnivora, is an important pathogen, which can cause local suppurative infection, pneumonia, pseudomembranous enteritis, and even sepsis and septicemia. According to statistics, in the United States, poisoning caused by staphylococcal enterotoxin accounts for 33% of the total bacterial food poisoning, while it reaches 45% in Canada, and there are not a few such poisoning incidents in China every year.
Streptococcus pneumoniae, abbreviated as pneumococcus, is the chief culprit of human lobar pneumonia. According to the relevant regulations in the "Regulations on Biosafety Management of Pathogenic Microorganism Laboratories", Streptococcus pneumoniae belongs to three categories, which is the most dangerous one.
Hemolytic streptococcus, also known as Sapirin, can cause purulent inflammation of skin and subcutaneous tissue, respiratory infection, outbreak of epidemic pharyngitis and pathological reactions such as neonatal sepsis, bacterial endocarditis, scarlet fever, rheumatic fever and glomerulonephritis.
There are many kinds of bacteria in the car, which not only affect health, but may even cause fatal risks. We must take protective measures.
The secret of car disinfection
Automobile disinfection can be divided into physical disinfection and chemical disinfection. Physical disinfection mainly refers to ultraviolet disinfection devices, and chemical disinfection refers to disinfectants such as alcohol.
1. Wipe the seat, center console, door handle, window, door inner panel and steering wheel that can withstand alcohol disinfection with 75% alcohol cotton cloth. It is recommended to remove the air conditioning filter element for cleaning at the same time. You can also use 1000mg/L chlorine-containing disinfectant or 500mg/L chlorine dioxide disinfectant to spray wine, spray, wipe or soak for 30 minutes and then wipe with water.
2. Choose 220v professional ultraviolet lamp with ozone disinfection for irradiation. Use external power supply, self-contained battery or vehicle power supply. After turning on the power supply, put the ultraviolet lamp on the vehicle seat for 30-60 minutes. At this time, people must leave. Irradiation for 30-60 minutes (power 8 watts, irradiation for 60 minutes; Power 15- 18 watts, irradiation for 30 minutes).
It should be noted that ultraviolet rays will accelerate dermal aging, and long-term use is not recommended. Ozone has a special smell. After disinfection, it needs ventilation 15 minutes to let the ozone smell disperse. In addition, alcohol is a flammable and volatile liquid, so remember to stay away from fire sources when using it. Keep away from fire and heat sources when storing, and the temperature shall not exceed 30℃ to prevent direct sunlight.
Although the number of bacteria mentioned above is extremely large, I prefer to attract users' attention rather than fear of bacteria. In fact, in the course of thousands of years of evolution, a biological relationship has been formed between organisms and bacteria, and bacteria or pathogens that cause diseases only account for a small part of bacteria. Most bacteria live in peace with people and even form an indispensable relationship. Therefore, in the face of bacteria, we need to face up to their existence and learn the correct protective measures to avoid the risks brought by that tiny part.
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This article comes from car home, the author of the car manufacturer, and does not represent car home's position.