Delta, a mutant strain of New Coronavirus, was named by WHO in May 2021 after the mutant strain B.1.617.2 of New Coronavirus first identified in India. On June 15, 2021, it was reported that the “Delta” variant had further mutated to give rise to the “Delta+” or “AY.1″ variant. ” variants. As of June 21, Delta, a variant of the new coronavirus first discovered in India, has spread to 92 countries worldwide.
The reason for the emergence of Delta
This is a characteristic of the virus itself. It belongs to the mRNA virus, which itself is prone to genetic mutation, and from the perspective of virus evolution and ecology, it is also a selective evolution of the virus, which is always able to select the characteristics that are conducive to its own survival and reproduction, and retain them after mutation.
What is the difference between delta virus and new coronavirus symptoms?
New coronavirus symptoms: fever, sore throat, no nasal discharge, loss of sense of smell and taste, body aches and pains, and non-red eyes.
Delta virus symptoms: no fever, sore throat, nasal discharge, loss of smell and taste, body aches and pains, red eyes, conjunctivitis, nosebleeds, rash, diarrhea and abdominal pain.
Incubation period of Delta strain
The incubation period in the body is relatively short, with onset within 2 to 3 days, and in some cases within 24 hours.
Characteristics of the Delta strain
1,Stronger transmission. This mutated strain has a transmission capacity that is one times higher than that of previous strains, and over 40% higher than that of the strain found in the UK. The “Delta” mutant strain is characterized by rapid transmission and a relatively short incubation period in the body, with onset in about 2 to 3 days, or even 24 hours in some people. In fact, it mainly refers to the speed from effective exposure, infection to clinical symptoms and onset of disease, the onset of disease has become shorter, or between each generation, the intergenerational transmission interval compared to the past epidemic strains, the average incubation period is shortened by one or two days, and the speed is correspondingly faster.
2,High viral load. A team of researchers from the United Kingdom found that people infected with the Delta variant had a 1-fold higher risk of hospitalization compared to those infected with the Alpa variant, which was first identified in the United Kingdom. Patients had a higher rate of conversion to severe and critical forms after the onset of the disease than before, and the time to conversion to severe and critical forms was earlier. Patients with very low CT values, the lower the CT value the higher the viral load in the body and the longer the time needed for the patient to turn negative for nucleic acid.
3,Pathogenicity. “The pathogenicity of Delta appears to have increased in India and in the UK, meaning that the proportion of infected people with symptoms has increased.
Vaccines are still effective against the Delta strain
Currently, vaccination against this virus is still effective, at least in preventing severe disease and reducing deaths. Vaccination is 69% more effective than non-vaccination in preventing infection in close contacts, 73% in preventing the development of pneumonia, and 95% in preventing the development of severe disease, which shows a significant preventive effect. Everyone should get vaccinated as early as possible.
1,Delta symptom one: a slight runny nose. Some people will have symptoms like a common cold with a runny nose at the beginning of a delta virus infection. If the manifestation is simply a runny nose, then it is basically less supportive of a novel coronavirus infection.
2,Delta symptom 2: A little sore throat. If there is contact with a person infected with Delta virus, or the trajectory has overlapping places, when there is a sore throat is likely to be infected with the virus, it must be paid great attention.
3,Delta symptom three: body aches and pains. Body aches and pains are one of the symptoms that can occur in some patients infected with the Delta virus, but body aches and pains do not necessarily mean that the infection is present. There are many diseases that can cause body aches and pains, such as influenza or the common cold. The most common diseases are influenza and common cold, and sudden strenuous exercise can cause body aches and pains.
4,Delta symptom four: the body is more weak. Weakness is a common symptom of delta virus infection, patients will feel no energy, it is recommended that if other symptoms occur at the same time, to go to the hospital to check whether the infection of the new crown virus.
5,Delta symptoms five: loss of taste and smell. Infection with delta virus affects the neurons in the nose and leads to loss of sense of smell. It is suspected that the virus affects the odor neurons in the nose, which send signals to the olfactory bulb in the brain, resulting in a lack of perception of taste and smell.
6,Delta Symptom 6: There is some diarrhea. According to the test data related to this local case in Nanjing and the local case in Zhengzhou, some of the confirmed cases showed diarrhea, which was never seen in the original New Coronavirus.
7,Delta symptom 7: more drowsy. In general, a small number of patients infected with the delta strain have experienced drowsiness. This is when you go to bed early at night, but still want to sleep during the day the next day.
8,Delta symptom eight: suffering from conjunctivitis. According to the Delta virus infection population, a small number of people appear to have conjunctivitis, which may be caused by infection, an inflammation of the conjunctiva caused by pathogenic microbial infection.
Preventing Delta virus countermeasures
1,Accelerate vaccination. We need to accelerate the vaccination and quickly promote wider coverage of the vaccine, which will also play a role in suppressing the spread of this virus and will effectively curb the occurrence of this virus mutation.
2,Produce second-generation vaccines. The so-called second-generation vaccine is hoped to produce a vaccine that can cope with various mutated strains, so that there is no need to worry about immune escape of the virus, but this research route is more complex and there is a huge uncertainty about the time of successful development.
3,Production of improved vaccines. The main idea is to add or replace old vaccines with new mutated strains of viruses and their genetic sequences, that is, existing vaccines. After the development of these vaccines, they can be used for renewal of vaccination with existing vaccines, and also for booster immunization with new and improved vaccines, including re-vaccination with new strains.
4,This time, the Delta strain is mainly responsible for more severe cases in the elderly and also in children.
Once again, we remind everyone to complete vaccination as soon as possible, wear masks, wash hands regularly, go to less or no crowded places, and do personal protection.
In the face of Delta mutant strain, we have to do
Don’t be careless, wear a mask, be hygienic, get vaccinated, have a one-meter line, gather less, ventilate more, travel less, and don’t hide.