Data Suggest Vaccines Make ‘Limited Difference in Infectiousness’ of Delta Variant: PHE

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The Epoch Times

Vaccinated people infected with the Delta variant of the CCP (Chinese Communist Party) virus, which causes COVID-19, may be as infectious as their unvaccinated counterparts, early analysis from Public Health England (PHE) suggests.

This coincides with a recent study from the United States, where similar results were observed in Wisconsin.

“Some initial findings … indicate that levels of virus in those who become infected with Delta having already been vaccinated may be similar to levels found in unvaccinated people,” PHE said in a statement.

“This may have implications for people’s infectiousness, whether they have been vaccinated or not,” it added. “However, this is early exploratory analysis, and further targeted studies are needed to confirm whether this is the case.”

The Delta variant, first identified in India, is currently the dominant CCP virus variant in England.

In a technical briefing (pdf) published on Aug. 6, PHE said that NHS Test and Trace case data show that since June 14, where cycle threshold (Ct) value data are available, the mean and median lowest Ct values are similar between vaccinated and unvaccinated people with the Delta variant, “with a median of 17.8 for unvaccinated and 18.0 for those with 2 vaccine doses.”

Ct value is the number of cycles needed to boost the viral signal in a sample when conducting an RT-PCR test.

The non-age-stratified data indicate that “whilst vaccination may reduce an individual’s overall risk of becoming infected, once they are infected there is limited difference in viral load (and Ct values) between those who are vaccinated and unvaccinated,” PHE said.

“Given they have similar Ct values, this suggests limited difference in infectiousness,” the document reads, adding that test-seeking behaviour and true changes in the data, such as the age distribution of cases, can influence the findings.

In a recent study from Wisconsin, the United States observed a similar result.

The preprint of the Wisconsin study, which is not yet peer-reviewed, said that “no difference in viral loads” was found when comparing unvaccinated individuals to those who have vaccine “breakthrough” infections, and that “individuals with vaccine breakthrough infections frequently test positive with viral loads consistent with the ability to shed infectious viruses.”

However, these findings contradict the findings of a recent study by Imperial College London (ICL).

The ICL-led Real-time Assessment of Community Transmission-1 study published the preprint of its latest report, which says that among all positive tests, the median Ct value was 27.6 for vaccinated participants and 23.1 for unvaccinated participants, suggesting that vaccinated people are less likely to pass the virus on to others.

By Lily Zhou

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