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Articles on Delta variant

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The list of SARS-CoV-2 variants – each with its own unique qualities that give it an edge – just keeps growing. Matt Anderson Photography/Moment via Getty Images

Alpha then delta and now omicron – 6 questions answered as COVID-19 cases once again surge across the globe

People are buzzing with questions about the omicron variant and whether it could help usher in herd immunity. A team of virologists deciphers the latest findings.
A positive COVID-19 test is the first step in the process. Paul Hennessy/SOPA Images/LightRocket via Getty Images

From delta to omicron, here’s how scientists know which coronavirus variants are circulating in the US

A nationwide genomic surveillance system analyzes positive COVID-19 tests to build a picture of which variants are spreading in the population.
South Africa is seeing a spike in COVID-19 cases. EMMANUEL CROSET/AFP via Getty Images

Omicron: evidence shows it evades immunity from earlier infection more than other variants

At this stage, we cannot say anything about the severity of cases with Omicron - either in primary or reinfections.
The omicron variant possesses numerous mutations in the spike protein, the knob-like protrusions (in red) that allow the virus to invade other cells. Juan Gaertner/Science Photo Library via Getty Images

Will omicron – the new coronavirus variant of concern – be more contagious than delta? A virus evolution expert explains what researchers know and what they don’t

It’s too early to say whether the newly identified omicron variant is going to overtake delta. But particular mutations in the new strain have researchers deeply concerned.
A bad flu year on top of the pandemic could mean trouble for already-stressed hospitals. George Clerk/E+ Collection via Getty Images

Flu season paired with COVID-19 presents the threat of a ‘twindemic,’ making the need for vaccination all the more urgent

Recent computer modeling shows the upcoming flu season might see a surge in cases. Coupled with COVID-19’s continued threat, doctors are again urging Americans to get their shots.
Perseverance took a selfie next to its biggest accomplishment yet – the two small drill holes where the rover took samples of Martian rocks. NASA/JPL-Caltech/MSSS

Perseverance’s first major successes on Mars – an update from mission scientists

Perseverance and its helicopter sidekick, Ingenuity, have been on Mars for nearly nine months. The duo have taken rock samples, performed first flights and taken images of the delta in Jezero Crater.

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