How can we prevent the new guandelta mutant that can be infected in “14 seconds without contact”?

Doing a good job in routine protection and blocking the “delta” strain is not only to protect ourselves, but also to protect others

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At a time when the global epidemic is raging, China has been regarded as a leader in resisting the epidemic

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However, on July 20, a notice from Nanjing Lukou Airport broke the calm in the past

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Since July 20th, the COVID-19 epidemic reported from Nanjing Lukou International Airport in Jiangsu has spilt into many provinces and cities such as Anhui, Sichuan, Liaoning, Hunan, Beijing and Guangdong

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The epidemic spread rapidly

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As of August 6, it spread to 20 + cities in 10 provinces in only 16 days

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The virus that caused the epidemic was the notorious Delta

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Similarly, the epidemic in Ruili and Guangdong this year is also Delta

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A novel coronavirus pneumonia case reported in India in September 2020 was first reported in the delta strain

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The WHO announced in May 10th this year that the delta variant should be included in the COVID-19 mutant strain that needs to be concerned globally

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At present, it has been prevalent in more than 130 countries and regions, and has become the main virus strain of the global novel coronavirus pandemic

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The virus strain has the characteristics of rapid transmission, rapid replication in vivo, long negative time and so on

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01  “ Why is delta so fierce? 1

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No contact for 14 seconds

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In Guangzhou, the police responsible for assisting the epidemiological investigation once released a surveillance video: in the same restaurant, Huang (the third-generation infected person) and Lu (the fourth-generation infected person) successively entered the bathroom and completed the virus transmission in 14 seconds without any physical contact

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2

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The value of basic infection number (R0) is greater

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The R0 value of Xinguan original strain is about 2.5, while the basic infection number (R0) of delta strain is about 5-8, that is, an infected person can infect 5 ~ 8 people, with stronger transmission ability, wider transmission range and greater impact on society

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3

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The viral load increased and the incubation period became shorter

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Studies have shown that the viral load of people infected with delta strain, that is, the number of viruses carried per milliliter of blood, can be up to 1260 times that of those infected with the original strain

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For example, a patient infected with a common virus will only excrete a virus of 1 within a certain period of time

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When a healthy person shares a room with the patient, he may not be exposed to the virus excreted by him, that is, a healthy person may not be infected

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However, when the number of viruses increased to 1260, the chance of healthy people exposed to the virus increased greatly

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4

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It has immune escape ability

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According to the data released by the public health bureau of England, after two complete injections of Pfizer vaccine, the effectiveness against alpha strain was 93.4%, while the protection against delta strain was only 87.9%

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This means that delta virus has a certain “immune escape” ability – that is, the ability to produce antibodies and prevent infection after vaccination is weakened

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02   Redefining the “close contact” and the emergence of the “delta” strain also redefined the close contact

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In view of the previous epidemic in Guangdong, Zhong Nanshan, academician of the Chinese Academy of engineering, once said that the past concept of close contact was no longer applicable to the “delta” strain

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In the past, the family members of the infected two days before the onset of the disease, colleagues in the office, and people who had meals and meetings within 1 meter belong to close contacts

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As for the “delta” mutant, those who had been together with the infected person four days before the onset of the disease in the same space, the same unit and the same building were close contacts

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03 Delta, how to protect? The blocking of the delta strain is not essentially different from the other variant strains of the novel coronavirus virus

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There are three main aspects: isolation of patients and disinfection of environment are the source of infection control

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Wearing masks and washing hands frequently are the key to cut off the route of transmission; Vaccination to protect vulnerable populations

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1

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Continue to insist on not leaving the country unless it is necessary, and do not travel or travel to medium and high-risk areas and tourist hot spots; 2

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Reduce going out and focus on outdoor activities; Avoid large-scale gathering activities and wear masks when going out; 3

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Reduce unnecessary gatherings and the spread of sharing meals; 4

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Actively vaccinate the novel coronavirus vaccine; 5

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Adhere to normal epidemic prevention and control measures, wear masks scientifically and do not reuse masks; Wash hands frequently and do not rub your eyes and nose with dirty hands at any time; Constant ventilation and window ventilation can dilute the “concentration” of virus suspended in the air, that is, reduce the infectious activity and quantity of virus; Divide the home according to the polluted area, semi polluted area and clean area: 1 square meter just entering the house is regarded as the polluted area, and change clothes and shoes in this area; A coat rack and shoe rack are placed near the door of the house

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Coats, shoes and keys are also placed here

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It is considered a semi polluted area

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These things should not be taken to the living room and bedroom (cleaning area); 6

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Maintain a healthy lifestyle and increase or decrease clothes according to temperature changes; Pay attention to the combination of work and rest, work and rest regularly, and pay attention to food hygiene; 7

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Do a good job of health monitoring

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If there are suspicious symptoms such as fever, dry cough and fatigue, get medical attention in time

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Do not go to work with illness, and report travel history, contact history and physical abnormalities to the unit

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In short, everything is unknown in the future

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At this stage, we must make preparations for COVID-19’s long-term existence

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As an ordinary person, what we can do is to wear masks and protect well.

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