Viral infection and transmission in a large well-traced outbreak caused by the Delta SARS-CoV-2 variant

Summary We report the first local transmission of the Delta SARS-CoV-2 variant in mainland China. All 167 infections could be traced back to the first index case. The investigation on daily sequential PCR testing of the quarantined subjects indicated the viral load of the first positive test of Delta infections was ~1000 times higher than that of the 19A/19B strains infections back in the initial epidemic wave of 2020, suggesting the potential faster viral replication rate...

....On May 21, 2021 the first local infection of the Delta variant in mainland China was identified...

...Our investigation on the quarantined subjects suggested for the Delta variant, the time window from the exposure to the detection of viruses was peaks at ~3.7 days and presented a higher infectiousness/transmission risk when the virus was first detected. In response to this notable viral parameter, the government required people leaving the Guangzhou city from airports, train stations and shuttle bus stations to show proof of a negative COVID-19 test within 72 hours on June 6 and further shorten into 48 hours on June 7, in contrast to the seven days in the 2020 epidemic....

Study at link.

Why did China conduct 30million PCR tests between the first detected case and Jun 18 if there were only 167 cases all related to the original?

CHina has been on border lockdown for over a year. China's first delta case was May 18th. When was the earliest outside-of-China delta case reported?

I haven't seen mentioned before that the contact to symptoms was 3.7 days for delta. Might be good to file under covid trivia.

Viral infection and transmission in a large well-traced outbreak caused by the Delta SARS-CoV-2 variant? Oh yeah?

This COVID thing is all bullcrap from the gitgo. The virus was never been isolated to be documented, it didn't fulfill Koch's postulate. If you google they got EM photos of the virus, in microbiology one thing to identify but another thing to really isolate. This baloney gotta stop. Now there's so-called delta variant blaming those dying from the jab, that's what they're calling killed by delta variant?

How many Chinese citizens have been killed by any form of the Coronavirus COVID 19?

Secondly, would a tampered with original Coronavirus by the Wuhan Lab, kekep evolving into more Variants including the potentially very deadly D Variant?

How would you detect this tampering, which was mentioned in some reports about a grove on the original Wuhan Bat virus?

Red Chinese deliberate biological warfare product or accidental development of Wuhan Bat virus studies?

thanks RC88. Right after the first ‘battle of the border’ ?

still on the detective trail, the Beta strain first surfaced in South Africa (china-origin?), and the Delta Plus strain, like the Delta strain was first reported in India. Delta Plus has elements of the Beta strain plus an additional spike protein mutation, K417N.

found this blurb from Yale:

” In mid-June, the CDC labeled Delta as “a variant of concern,” using a designation also given to the Alpha strain that first appeared in Great Britain, the Beta strain that first surfaced in South Africa, the two Epsilon variants first diagnosed in the U.S., and the Gamma strain identified in Brazil...”

and, same article:

“There are additional questions and concerns about Delta, including Delta Plus—a subvariant of Delta, that has been found in the U.S., the U.K., and other countries. “Delta Plus has one additional mutation to what the Delta variant has,” says Dr. Yildirim. This mutation, called K417N, affects the spike protein that the virus needs to infect cells, and that is the main target for the mRNA and other vaccines, she says.

“Delta Plus has been reported first in India, but the type of mutation was reported in variants such as Beta that emerged earlier. “

https://www.yalemedicine.org/news/5-things-to-know-delta-variant-covid

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