In a recent study conducted at the Baylor College of Medicine, Houston, USA, scientists have identified six vaccine breakthrough cases caused by the delta variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
A vaccine breakthrough case is defined as the detection of SARS-CoV-2 infection in individuals who are fully vaccinated against coronavirus disease 2019 (COVID-19). The study is currently available on the medRxiv* preprint server.
Background
Recently, India has seen a significant rise in new COVID-19 cases predominantly caused by the delta variant (B.1.617.2) of SARS-CoV-2. Similar to the alpha (B.1.1.7), beta (B.1.351), and gamma (P.1) variants, the delta variant has gained beneficial mutations in the spike protein, which make it more infectious and pathogenic than previously circulating variants.
The delta variant belongs to the B.1.617 lineage that is currently circulating in more than 50 countries. Because of its significant threat to public health, the delta variant has been designated as the Variant of Concern (VOC) by the World Health Organization.
Studies investigating vaccine efficacy against emerging SARS-CoV-2 variants have indicated that the delta variant is partially resistant to vaccine-induced antibodies. A study conducted in the UK has indicated that the Pfizer/BioNTech COVID-19 vaccines is 88% effective in preventing symptomatic disease caused by the delta variant.
In the current study, the scientists have described the transmission of delta variants among family members who were attending a wedding ceremony with 92 guests. The wedding events were held outside in a large open-air tent, and all guests were fully vaccinated.
Important observations
The scientists identified a total of six individuals at the wedding ceremony who tested positive for SARS-CoV-2 and were symptomatic. Of them, one developed severe COVID-19 requiring monoclonal antibody infusion and one died eventually. Based on encounter timings and viral sequence similarities, the scientists suggested that two persons traveling from India probably have transmitted the delta variant to other guests during the wedding events.
Soon after developing symptoms including fatigue, cough, and fever, both guests from India tested positive for SARS-CoV-2 infection. At day 6 post-wedding, the man without comorbidity was admitted to a hospital because of worsening symptoms. One month after the wedding, he died due to COVID-19 related complications.
Four other guests who also tested positive for SARS-CoV-2 had confirmed interactions with the guests from India. Of 4 guests who were fully immunized with the Pfizer/BioNTech or Moderna COVID-19 vaccine, one developed severe COVID-19 that required infusion of monoclonal antibodies.
Testing of viral variant
Nasopharyngeal swab samples were collected from all six guests and analyzed by reverse transcription-polymerase chain reaction (RT-PCR) to detect viral variants. All samples tested positive for the original Wuhan strain of SARS-CoV-2 and negative for the alpha variant. All positive samples were subsequently sequenced by Swift Normalase Amplicon Panels with multiple overlapping amplicons to identify the causative variant. The findings revealed that all six guests were infected with the delta variant of SARS-CoV-2 (B.1.617.2).
News
Researchers Compare MS Models to Human Tissue in Search for Better Therapies
Researchers identified key differences between two widely used multiple sclerosis models, showing how each can better study myelin damage, immune responses, and repair. The findings may improve efforts to develop treatments that restore lost [...]
Scientists Discover Genetic “Off Switch” That Supercharges CAR T Cells Against Cancer
A new study reveals a possible way to make CAR T-cell therapy more durable and effective by targeting a single gene-regulating protein. CAR T-cell therapy is widely seen as a breakthrough in personalized cancer [...]
New Vitamin B12-Based Therapy Could Change How Brain Cancer Is Treated
Researchers have identified a vitamin B12–based compound that appears capable of crossing the blood–brain barrier and selectively accumulating in glioblastoma tissue. For decades, one of the biggest problems in brain cancer treatment has had [...]
Simple Fiber Supplement Cuts Knee Arthritis Pain in Just 6 Weeks, Study Finds
A daily inulin supplement may help reduce knee osteoarthritis pain while revealing a possible link between gut health, muscle function, and pain sensitivity. For millions of people living with knee osteoarthritis, managing chronic pain [...]
This Common Vitamin May Help Stop Prediabetes From Turning Into Diabetes
Vitamin D may help prevent type 2 diabetes in people with specific genetic variations, offering a possible path toward personalized diabetes prevention. More than 40% of U.S. adults have prediabetes, a condition in which [...]
Ebola, hantavirus: Is the world prepared for the next pandemic?
Funding cuts to health research and a growing antivaccine movement are making it harder than ever to respond to viruses. The World Health Organization (WHO) has declared that an Ebola outbreak in Uganda and [...]
May 2026 Healthcare News and Trends: Market Signals That Matter
Artificial intelligence is dominating headlines, telehealth has settled into a new normal, and digital health continues to promise transformation. However, much of what is being discussed in healthcare today reflects potential rather than reality. [...]
Scientists Rewire Donor Stem Cells To Outsmart Aggressive Blood Cancers
Researchers have tested a gene-edited stem cell transplant designed to shield healthy blood-forming cells from powerful cancer-targeting immunotherapies. For patients with highly aggressive blood cancers, stem cell transplantation can offer a rare chance at [...]
Recent Digital Health Trends, Insights and News – May 2026
Last month marked continued progress as digital health moves into its next phase — from AI expanding into drug discovery and core infrastructure to new federal pathways accelerating device access and home-based care. Together, [...]
Cancer Mystery Solved: Scientists Discover How Melanoma Becomes “Immortal”
Scientists have uncovered a previously overlooked mechanism that may help melanoma cells become effectively “immortal.” Cancer cells face a major problem before they can become deadly: They have to figure out how to stop [...]
How Visual Neurons Organize Thousands of Synaptic Inputs
Summary: A new study uncovered the organizational rules that determine how neurons in the primary visual cortex process information. By imaging both the cell bodies (soma) and the individual synapses (on dendritic spines) of [...]
Scientists Just Found a Surprising Way To Destroy “Forever Chemicals”
Scientists have uncovered a new mechanism that may help break down highly persistent PFAS pollutants. PFAS have earned the nickname “forever chemicals” for a reason. These industrial compounds are so chemically durable that they [...]
Scientists Discover Cheap Material That Kills Deadly Superbugs
A new sulfur-rich antimicrobial polymer shows strong effectiveness against fungal and bacterial pathogens and may offer an affordable solution to antimicrobial resistance. Antimicrobial resistance is creating growing challenges for both healthcare and food production, [...]
What to Know About Cicada, or BA.3.2, the Latest SARS-CoV-2 Variant Under Monitoring
Like periodical cicadas, the insects for which it is nicknamed, SARS-CoV-2 Omicron subvariant BA.3.2 is only just beginning to emerge after lying low for an extended period since it first appeared. Although it was [...]
Scientists Say This Simple Supplement May Actually Reverse Heart Disease
Scientists in Japan say a common supplement may actually help “unclog” certain diseased heart arteries from the inside out. A simple food supplement sold in Japan may have helped reverse a dangerous form of [...]
New breakthrough against radiation: Korean Scientists create revolutionary shield with nanotechnology
Korean Scientists develop new nanotechnology material capable of reducing radiation impacts in space missions, hospitals, and power plants. The search for more efficient protection technologies in extreme environments has just gained an important advance. Korean [...]
