https://virological.org/t/viral-infection-and-transmission-in-a-large-well-trace...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.
https://asm.org/Articles/2021/July/How-Dangerous-is-the-Delta-Variant-B-1-617-21. How contagious is the Delta variant?
Scientifically accurate atomic model of coronavirus (SARS-CoV-2). Scientifically accurate atomic model of coronavirus (SARS-CoV-2).
Source: Alexey Solodovnikov (Idea, Producer, CG, Editor)
Data indicate that Delta is 40-60% more transmissible than Alpha and almost twice as transmissible as the original Wuhan strain of SARS-CoV-2. Furthermore, significantly more viral particles have been found in the airways of patients infected with the Delta variant.
A Chinese study reported that viral loads in Delta infections were ~1,000 times higher
than those in infections caused by other variants. In response this information, the World Health Organization (WHO) regards Delta as “the fastest and fittest” variant so far.