Cause of occurrence
Delta virus itself is prone to genetic mutation. This is also a selective evolution of the virus, which can always choose some characteristics that are beneficial to its own reproduction and survival, and keep them after mutation.
clinical symptoms
The main symptoms of patients infected with Delta virus are not only fever, cough, loss of taste and smell, but also a bad cold, headache, sore throat and runny nose. Mislead many infected people, continue to go out and accelerate the spread.
What are the characteristics of Delta virus?
First, the communication power is stronger.
The transmission ability and infectivity of δ mutant virus were significantly enhanced, and the incubation period or passage interval was shortened. 10 can be transmitted for 5 or 6 generations in a day, which is more suitable for human body. The spread of the virus is accelerating. The viral load increased significantly. Compared with the previous strain, the transmission ability of this mutant strain has doubled.
Second, the viral load is high.
People infected with the Delta virus strain are at high risk of hospitalization. The proportion of patients who turned to severe and critical illness after onset was higher than that before onset, and the time of turning to severe and critical illness was earlier. The higher the viral load in the body, the longer it takes for the patient's nucleic acid to turn negative.
Third, there may be immune escape, but the vaccine still has protective effect.
The proportion of patients who were not vaccinated turned to severe disease was significantly higher than that of patients who were vaccinated, and the vaccine still had a protective effect on the new strain. In addition, compared with unvaccinated cases, the time from diagnosis to antibody positive in vaccinated cases is shorter, the CT value is higher and the hospitalization time is shorter.
Fourth, pathogenicity.
The spread of Delta in India and Britain seems to increase its pathogenicity, which means that the proportion of infected people with symptoms has increased.
In the current epidemic prevention and control, we must strengthen these points:
First of all, the tracing and isolation of close contacts is an important way to cut off the community spread of mutant strains in COVID-19.
Completely isolate or designate a single person for daily contact, and strengthen the control of close contacts.
Second, nucleic acid detection plays an irreplaceable role in the early detection of infectious sources.
All medical institutions should do a good job in pre-inspection and triage in strict accordance with the requirements of national standards, and carry out nucleic acid testing for people with relevant epidemiological history, fever, cough and other symptoms, all inpatients, medical staff and other key groups in COVID-19.
Third, speed up vaccination and establish an immune barrier as soon as possible.
Everyone should continue to implement effective sensory control measures, including keeping a safe social distance from others, observing cough etiquette, washing hands frequently, wearing masks, cleaning and disinfecting environmental surfaces, and maintaining indoor ventilation.
Fourth, avoid going to crowded places.
Pay attention to the personal protection of medical staff in high-risk operations such as bronchoscopy, pulmonary function examination and dental treatment to avoid occupational exposure.
The epidemic is not over yet, and there is still a long way to go to prevent and fight the epidemic, which requires the concerted efforts of all of us in Qi Xin.