How do vaccinated people spread Delta? What the science says.

  title={How do vaccinated people spread Delta? What the science says.},
  author={Nidhi Subbaraman},
Assessing the risk between vaccination status and infections within families with COVID-19 cases in Spain
Young women, social health workers, ethnic minority groups, and people with chronic diseases are the completely vaccinated contacts with the highest risk of having COVID-19, after primary cases also vaccinated in the family, in Toledo (Spain), when the delta variant became dominant but before the rise of omicron.
Covid-19 vaccines work but other factors play a relevant role: A data analysis on spread and mortality in 24 countries
This work indicates that mass vaccination is associated with a lower spread of the pandemic and, to greater extent, with a lowering of mortality in infected people.
Delta Variant: The New Challenge of COVID-19 Pandemic, an Overview of Epidemiological, Clinical, and Immune Characteristics
Although reduced efficiency of vaccines on this variant and its higher pre-symptomatic transmissibility have made it complicated to control the disease, higher vaccination coverage and following sanitation rules can help control the outbreaks.
Strategic Plan and Limitations in Tackling Delta Variant Outbreak in Bangladesh
The actions taken by the government of Bangladesh to limit the potential for over ascendancy of the Delta variant, with all its limitations are emphasized.
Comparison of analytical sensitivity and efficiency for SARS-CoV-2 primer sets by TaqMan-based and SYBR Green-based RT-qPCR
ORF1ab and 2019_nCoV_N3 were the best combination for sensitive and reliable SARS-CoV-2 molecular diagnostics due to their high sensitivity, specificity, and broad accessibility.
An observational study of the Covid‐19 situation following the first pan‐European mass sports event
A general increase in Covid-19 positivity trend in Europe was observed following a week of EURO2020 matches across most countries and host cities, and a similar trend was observed for the Delta variant sample positivity rate.


Outbreak of SARS-CoV-2 Infections, Including COVID-19 Vaccine Breakthrough Infections, Associated with Large Public Gatherings — Barnstable County, Massachusetts, July 2021
Findings from this investigation suggest that even jurisdictions without substantial or high COVID-19 transmission might consider expanding prevention strategies, including masking in indoor public settings regardless of vaccination status, given the potential risk of infection during attendance at large public gatherings that include travelers from many areas with differing levels of transmission.
Vaccinated and unvaccinated individuals have similar viral loads in communities with a high prevalence of the SARS-CoV-2 delta variant
It is suggested that if vaccinated individuals become infected with the delta variant, they may be sources of SARS-CoV-2 transmission to others, and there is no difference in viral loads when comparing unvaccinated individuals to those who have vaccine "breakthrough" infections.
Virological and serological kinetics of SARS-CoV-2 Delta variant vaccine-breakthrough infections: a multi-center cohort study
The mRNA vaccines are highly effective at preventing symptomatic and severe COVID-19 associated with B.1.617.2 SARS-CoV-2 infection and remains a key strategy for control of CO VID-19 pandemic.