- A new CDC study looked at 6,798 samples positive for COVID-19 between March 4 and July 21 at Kaiser Permanente Southern California.
- As of May the alpha version was the major version, accounting for 95% of cases, before Delta took over, accounting for 67% of infections.
- Adults between the ages of 18 and 44 accounted for more than half of the 55.3% positive Delta samples.
- Hispanics were the race/ethnicity most likely to be confirmed to be ill with the delta variant, accounting for 39.4% of all infections.
- Uninfected patients infected with Delta were 1.7 times as likely to be hospitalized as fully vaccinated patients with infection.
A new report finds that the highly permeable Delta variant made up almost all cases in Southern California by mid-summer, with some groups at higher risk of infection.
Researchers at the Centers for Disease Control and Prevention (CDC) found that the variant accounted for 95 percent of COVID cases undergoing genome sequencing at Kaiser Permanente Southern California (KPSC) as of July 21.
Hispanic Americans and adults under the age of 45 were most likely to be confirmed to have DELTA.
What’s more, the report found that uninfected patients infected with Delta were nearly twice as likely to be hospitalized than fully vaccinated patients who had successfully been infected.
A new CDC report from Kaiser Permanente Southern California found that adults between the ages of 18 and 44 accounted for more than half of the positive Delta samples at 55.3%.
The most likely race/ethnicity confirmed with Delta was Hispanics, accounting for 39.4% of all infections
Known as B.1.617.2, the delta variant first originated in India and was labeled a ‘double mutant’ by the country’s health ministry because it contains two mutations: L452R and E484Q.
L452R is the same mutation seen with the California homegrown variant and similar to the mutation seen with the E484Q beta and gamma variants.
Both mutations occur on key parts of the virus that allow it to enter and infect human cells.
The delta variant is twice as contagious as previous variants, and some studies have suggested that it may cause more severe disease in unvaccinated people than earlier strains.
The CDC says Delta and its sub-lineages currently account for 99.5 percent of all new infections in the US
However, there is little research detailing the demographic breakdown of the different types of people infected, including Delta.
for new report good, published on Thursday, the team looked at patients’ data at KPSC.
The researchers sequenced data from 6,798 samples positive for COVID-19 between March 4 and July 21.
Of the positive samples, 88 percent came from unvaccinated patients, 10 percent from fully vaccinated patients and two percent from partially vaccinated patients.
First, alpha, which originated in the UK, made up the most cases, rising from 20 per cent in early March to 67 per cent by May 19.
The alpha version made up the majority of cases from March to May, rising from 20% to 67%, accounting for 95% of all cases, before the delta version took over.
However, the delta variant soon took over, and by July 21, it made up 95 percent of all samples that were subject to sequencing.
The researchers found that certain age groups had a much higher risk of contracting delta.
Of the samples that were positive for the variant, more than half — 55.3 percent — were between the ages of 18 and 44.
“Similar to previous reports, individuals with infections attributed to the delta variant were younger relative to all individuals with positive sequenced samples,” the authors wrote.
‘This may be due to several factors, including increased vaccination coverage among older adults and increased social interaction among young adults, when the delta variant predominates.’
There were also big differences when it came to race and ethnicity.
Hispanic Americans made up the majority of Delta samples at 39.4 percent, while white patients made up the second highest amount at 28.7 percent.
Similarly, differences in the prevalence of delta type infections across race/ethnicity categories may reflect differences in the risk of COVID-19 exposure among these individuals during periods of high delta variant transmission, the authors wrote.
The researchers also compared outcomes for patients infected with Delta based on vaccination status.
Fully vaccinated patients were 6.6 percent more likely to be hospitalized compared to 3.9 percent.
These findings reinforce the importance of ongoing monitoring of SARS-CoV-2 variants and implementing multicomponent COVID-19 prevention strategies, particularly during the current period in which Delta is the dominant circulating variant in the United States.
‘Such preventive strategies include increasing COVID-19 vaccination coverage among eligible populations in coordination with other strategies such as universal masking and physical distancing.’