Infected in 14 seconds?

The mutated strain of the new coronavirus, Delta, was first discovered in India.

Yesterday (22) afternoon, Shenzhen held a press conference on epidemic prevention and control and notified it.

4 cases in Shenzhen and Dongguan once ate at the same McDonald's

@ News on June 22.

On the evening of June 12, when Li and her husband Xiao Moumou (had been diagnosed in Shenzhen) were dining at the "McDonald's Restaurant" in the Ma Yong Galaxy City Mall, Jia Moumou and Jing Mo happened to be in the same restaurant

The New Crown Pneumonia Epidemic Prevention and Control Headquarters in Mayong Town, Dongguan City issued a notice on the declaration and investigation of personnel in key places.

On June 20 and 22, Dongguan City reported 1 confirmed case of new coronary pneumonia, all of which were students of Guangzhou Xinhua University (Dongguan campus)

Case 1: Jia Moumou (male), who was judged to be a confirmed case of new coronary pneumonia (common type) by expert consultation on June 20, has been transferred to a designated hospital for isolation and treatment

June 12: From 17:45 to 21:30, McDonald's, Machong Galaxy City

June 14: From 17:20 to 20:30, a little milk tea at Machong Galaxy City Jiarong Supermarket, Watsons and Machong Maker Square

June 15: From 20:00 to 21:40, Lanzhou Beef Noodle Shop on Gumei Road, Machong Town, Machong Chuangkefang Yizhan Convenience Store

June 17: From 19:00 to 21:00, Machong Galaxy City Jiarong Supermarket, Machong Maker Faire Maker Faire

Case 2: Jing (male), diagnosed as a confirmed case of new coronary pneumonia (light type) by expert consultation on June 21, has been transferred to a designated hospital for isolation and treatment

June 12: From 18:00 to 21:00, Machong "DHair" barber shop, MacDonald's restaurant in Galaxy City Mall, Macong, TOP ONE Korean fried chicken shop

June 13: From 14:30 to 20:50, Starbucks, Fisherman Internet Cafe, Niu Shan Ji Restaurant in Machong Galaxy City Plaza

June 14: From 18:00 to 20:00, authentic Daojiao meatballs, Machong Market, Machong Galaxy City Jiarong Supermarket, Aaron Fruit outside the west gate of Xinhua University

June 16th: From 17:45 to 18:45, Wuguyufen Machong Store, Fruit and Honey Garden

June 17: From 18:45 to 20:30, a little milk tea at Machong Chuangkefang, Northeast Dumpling House of Chuangkefang
.

On June 21, the activity trajectory of the confirmed patient Aunt Liu was announced
.

The outbreak in Guangzhou this time was caused by the B.
1.
617.
2 mutant strain that was first discovered in India.
The World Health Organization named this mutant strain "Delta"
.

Passed five or six generations in 10 days? Infected within 14 seconds of contact?

On June 11, Feng Zijian, a researcher at the China Center for Disease Control and Prevention, stated at a press conference of the Joint Prevention and Control Mechanism of the State Council that from the domestic epidemic, the first Delta virus mutant strain that appeared in India was contagious and spread The increase, the incubation period or the passage interval has been shortened, and the spread of the virus has been accelerated for five or six generations in just 10 days
.

According to the Beijing News "Emergency Call" report on June 21, the Guangzhou police found in the process of contacting and tracing a four-generation key case that the third-generation contact and the fourth-generation contact completed the transmission in only 14 seconds
.

According to the surveillance pictures released by the police, Huang and Lu (the fourth-generation infected person) were having a meal, and the two entered the bathroom separately.
Both parties completed the virus transmission within 14 seconds without touching their limbs
.
Later, the police added that the virus spread within 14 seconds under the same environment, which is the shortest contact time in this round of epidemic!

Why does the "delta" strain spread so fast?

Many experts believe that the "Delta" strain has the characteristics of strong transmission, short incubation period, high viral load, and rapid development of the disease, which poses challenges to epidemic prevention and control
.

1.
Increased communication

On June 11, at a press conference on the Joint Prevention and Control Mechanism of the State Council, Feng Zijian, a researcher at the China Centers for Disease Control and Prevention, said that from the situation of cases in this round of the epidemic in Guangzhou, the infectivity and transmission capacity of the "delta" mutant virus has been significantly enhanced
.
In addition, the incubation period or the passage interval is shortened, and the virus has been transmitted for five or six generations in just 10 days, and the spread of the virus is accelerating
.
The results of PCR detection of the virus in the samples of the infected showed that the viral load has the characteristics of a significant increase
.

"Existing research data shows that this mutant strain has a relatively strong spreading ability.
It is the strongest among the several mutant strains that the WHO has identified as'need to pay attention', and the spreading ability of older strains is stronger than in the past.
It has doubled, which is more than 40% higher than the transmission capacity of the strain found in the UK
.
" Feng Zijian said
.

2.
High viral load

On June 10, Guan Xiangdong, an expert from the Guangdong Working Group of the Joint Prevention and Control Mechanism Comprehensive Team of the State Council and the director of the Department of Critical Care Medicine of the First Affiliated Hospital of Sun Yat-Sen University, said in an interview with CCTV News that the patients in the Guangzhou epidemic would be transferred after they became ill.
The proportion of severe and critical cases is higher than before, and the time for the conversion to severe and critical cases is earlier
.
The CT value of the patient is very low.
The lower the CT value, the higher the viral load in the body, and the longer the time it takes for the patient to turn negative nucleic acid
.

Guan Xiangdong Accepts CCTV News Interview

3.
The vaccine still protects

There may be immune escape, but existing vaccines still have a protective effect
.
Feng Zijian, a researcher at the Chinese Center for Disease Control and Prevention, said that international studies have shown that this mutant virus may have a certain immune escape phenomenon
.
However, several existing vaccines still have considerable immune effects against this mutant virus
.

"From the perspective of the epidemic in Guangdong, the proportion of people who have not been vaccinated among the confirmed cases who have become severely ill or have been severely ill is significantly higher than that of people who have been vaccinated.
This shows that after vaccination, they still have immunity to the mutant strain.

"Feng Zijian said
.