New Zealand has been free of COVID-19 community infection since February, but a single confirmed case in Auckland has seen the government again adopt the ‘go hard, go early’ approach.
Articles on Delta variant
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Vaccinations, masks and some distancing – along with low community transmission – can help protect students in classrooms and cafeterias.
COVID can cause heart inflammation, abnormal heart rhythms, blood clots in the legs and lungs, stroke, and heart failure.
New variants of the COVID-19 virus may be more contagious and cause more severe disease than the original. A pediatrician and infectious disease specialist explains why.
After the CDC changed course in late July, recommending universal masking indoors, Nevada became the first state to adopt a flexible masking policy that can quickly adjust to changing COVID-19 rates.
Here’s what signs parents can look out for, and what to do if their child is feeling overwhelmed.
It seems things have shifted slightly since earlier in the pandemic. A growing proportion of people hospitalised with the Delta strain are aged in their 30s or 40s.
We need to understand the student activities and movements that are spreading the Delta variant of the virus in the latest Brisbane outbreak.
When politicians and others speak about herd immunity, unfortunately, they are under the misconception that the current tools that we’ve got are adequate to eliminate the virus.
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Governments should drop the idea of herd immunity. It risks leaving people feeling disillusioned by vaccination campaigns.
Nigeria must increase its testing capacity and do more genomic studies to deal effectively with the Delta variant of COVID-19.
The new Delta variant presents a considerable threat due to its significantly increased transmissibility rather than severity.
COVID will be with the world for the foreseeable future. The challenge is to learn to live with the virus effectively, protecting public health while reconnecting with each other.
The CDC guidance applies to areas with high coronavirus transmission rates – which on the day of the announcement covered 63% of US counties.
Once we achieve herd immunity, people who are not vaccinated benefit indirectly from the immunity of those around them. But it’s not easy to say exactly when we’ll reach this threshold for COVID-19.
Parents face tough choices since young kids can’t yet get COVID-19 vaccinations. An infectious diseases expert offers guidance on navigating summer activities.
NSW’s successful test and trace strategy controlled the Crossroads Hotel outbreak a year ago without needing a stringent lockdown. But this has not worked as well against Delta.
Simultaneously high levels of virus and vaccination will give further evidence of just how protective COVID-19 vaccines are.
As Los Angeles County again mandates masking indoors – even for the fully vaccinated – local health officials in the U.S. are closely eyeing their own COVID-19 vaccination and infection rates.
A French study found a four to sixfold reduction in neutralisation against the delta variant compared with the alpha (Kent) variant.
Top contributors
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Dean Faculty of Health Sciences and Professor of Vaccinology at University of the Witwatersrand; and Director of the SAMRC Vaccines and Infectious Diseases Analytics Research Unit, University of the Witwatersrand
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Professor in Applied Mathematics, University of Canterbury
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Professor of Pathology, Microbiology and Immunology, University of South Carolina
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Professor of Epidemiology, Medicine, and Infectious Diseases and Microbiology, University of Pittsburgh
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Adjunct Professor of Epidemiology, University of Texas Health Science Center at Houston
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Professor and Tier 1 Canada Research Chair in Global Health Governance; Scientific Co-Director, Bridge Research Consortium, Simon Fraser University
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Professor of Pathology, Microbiology and Immunology, University of South Carolina
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Paediatrician and Infectious Diseases Specialist; Clinical Researcher, University of Sydney
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Professor and Department Chair of Infectious Diseases and Microbiology, University of Pittsburgh
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Professor of Epidemiology, University of Auckland, Waipapa Taumata Rau
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Research Fellow, Pandemics & Borders Project, Simon Fraser University
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Professor of Global Biosecurity, NHMRC L3 Research Fellow, Head, Biosecurity Program, Kirby Institute, UNSW
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Associate Professor and Research Leader in Virology and Infectious Disease, Griffith University
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Associate Professor, Child and Adolescent Health, University of Sydney
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Head: Zoonotic, Arbo and Respiratory Virus Programme, Professor, Department Medical Virology, University of Pretoria