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Artículos sobre SARS-CoV-2

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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.
Scientists find variants by sequencing samples from people that have tested positive for the virus. Lightspring/Shutterstock

The hunt for coronavirus variants: how the new one was found and what we know so far

There’s a new COVID lineage called B.1.1.529. It has a genetic profile very different from other circulating variants
The best way to stop a contagious virus like COVID-19 is through a worldwide vaccination program. Patrick T. Fallon/AFP via Getty Images

Is COVID-19 here to stay? A team of biologists explains what it means for a virus to become endemic

Some viruses go extinct, while others stick around. The virus that causes COVID-19 seems likely to remain with us for the long term.
Experts estimate that close to 90% of the U.S. population must be vaccinated to reach herd immunity for COVID-19. David McNew/AFP via Getty Images

What is herd immunity? A public health expert and a medical laboratory scientist explain

Vaccination campaigns like the ones that eventually eliminated polio and measles in the United States required decades of education and awareness in order to achieve herd immunity in the U.S. population.
Many long COVID-19 symptoms – such as fatigue, brain fog and memory impairment – are similar to those experienced post-concussion. Cavan Images/Cavan Collection via Getty Images

How to help kids with ‘long COVID’ thrive in school

When a student suffers a concussion, their school typically offers certain accommodations – lighter workload, rest breaks, more time to complete tests. Do kids with long COVID need the same?
South Africa has extended COVID-19 vaccination to adolescents between 12 and 17 years old. Sharon Seretlo/Gallo Images via Getty Images

COVID-19: unpacking South Africa’s plan to vaccinate adolescents

Countries like the United States, Denmark, Germany, Spain and Switzerland have already vaccinated many millions of adolescents and their experience will guide countries that follow suit.

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