How Does the COVID Delta Variant Compare?

This post is by Omri Wallach from Visual Capitalist

How Does the COVID Delta Variant Compare

How Does the COVID Delta Variant Compare?

In late 2020, a variant of COVID-19 was detected in India that began to quickly spread.

Soon after it received the label “Delta,” it started to become the predominant strain of COVID-19 in countries of transmission. It spread faster than both the original disease and other variants, including “Alpha” that had taken hold in the UK.

Now the COVID-19 pandemic has essentially become the Delta pandemic, as the variant accounts for more than 90% of global cases.

But how does the COVID-19 Delta variant differ from the original disease? We consolidated studies as of September 2021 to highlight key differences between COVID-19 and the dominant variant. Sources include the CDC, Yale Medicine, and the University of California.

COVID-19 vs COVID-19 Delta Variant

At first glance, infections caused by the Delta variant are similar to the original COVID-19 disease. Symptoms reported from patients include cough, fever, headache, and a loss of smell.

But studies showed that the difference was in how quickly and severely patients got sick:

  • Spread rate: How quickly the infection spreads in a community (based on the R0 or basic reproductive number). The Delta variant spread 125% faster than the original disease, making it potentially as infectious as chickenpox.
  • Viral load: How much of a virus is detectable in an infected person’s blood, with higher loads correlating with more severe infections. Delta infections had a 1000x higher viral load.
  • Virus detectable: How long after exposure a virus is detectable in an (Read more...)