A research paper pulled together by Dr Nina Pierpon PhD, in New York says the current covid-19 vaccines provide no protection to the Delta variant and that natural herd immunity confers longer-lasting and stronger protection against infection.
Her paper – Why Covid-19 Vaccine Mandates Are Now Pointless – says scientific research papers published or posted in August 2021 “clearly demonstrate that current vaccines do not prevent transmission of SARS-CoV-2”.
Pierpoint’s paper concludes: “Since the principal reason for covid-19 vaccine mandates – protecting others from infection – has evaporated with the ascendance of the Delta variant, those who mandate covid-19 vaccines may wish to seek legal counsel regarding their culpability and liability (including personal) for potential long-lasting harm to those whom they pressure into vaccination with threat of exclusion from employment or education or other public activity.”
Pierpoint says a report by the Massachusetts Department of Health and the CDC, published August 6, 2021 in the CDC’s Morbidity and Mortality Weekly Report reveals an outbreak of covid-19 occurred in Provincetown, Massachusetts in July 2021 during two weeks of heavily attended indoor and outdoor public gatherings.
The study focuses on the 469 cases among Massachusetts residents who were in attendance. All successfully gene-sequenced isolates (120) were the Delta variant.
She says 346 of the cases in Massachusetts residents (74%) occurred in fully vaccinated people who had received a 2-dose course of the BioNTech/Pfizer or Moderna vaccine, or a single dose of the Johnson & Johnson. Vaccine coverage at this time among all Massachusetts residents was 69%.
“This suggests that vaccinated people became infected just as frequently as unvaccinated people in this outbreak.”
The next study, released August 10, 2021, examines the Delta viral load phenomenon in far more detail, and shows clearly that vaccinated people can become infected and pass the infection to other vaccinated people. The Hospital for Tropical Diseases in Ho Chi Minh City in southern Vietnam has about 900 staff members, including an Oxford University Clinical Research Unit. The entire hospital staff was vaccinated with the Oxford-AstraZeneca vaccine two-dose series in March and April 2021, and then enrolled in a post-vaccination study. Thus, a great deal of detailed information was available when the outbreak struck. 
The entire hospital staff was PCR negative for SARS-CoV-2 in mid-May 2021. The index case (first known case in a cluster) became mildly ill on June 11 and had a positive PCR with a high viral load. The whole staff was then re-tested. 52 additional cases were identified immediately. Ten more had high viral loads, a number being staff who shared an office with the index case. All the additional cases at first had no symptoms.
The hospital was then locked down. Over the next two weeks, 16 additional cases were identified in subsequent PCR surveys. 62 of the 69 PCR-positive cases participated in this study of the outbreak.
What about natural immunity from previous covid-19 infection, with regard to the change in virus strain? An Israeli study posted on August 25, 2021 powerfully shows that “natural immunity [from previous covid-19 infection] confers longer-lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS- CoV-2 compared to the BNT162b2 [BioNTech/Pfizer] two-dose vaccine-induced immunity.”
A Danish study of 203 recovered covid patients shows that covid-19 infection/disease provokes robust immune responses in the vast majority of people regardless of disease severity, including mild cases and even true asymptomatic cases (excluding those with false positive tests).
Nina Pierpont is a graduate of Yale University (BA in biology), with a MA and PhD from Princeton University in population biology/evolutionary biology/ecology, and the MD degree from the Johns Hopkins University School of Medicine. She has been a Clinical Assistant Professor of Pediatrics at Columbia University’s College of Physicians & Surgeons. She is currently in private practice in upstate New York, specializing in behavioral medicine.