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Articles on Herd immunity

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Avian cholera is a highly contagious disease that has produced rapid population loss in Northern common eiders. (Shutterstock)

How Arctic sea ducks develop herd immunity from avian cholera

We can learn about the spread of diseases through populations by studying naturally occurring instances of herd immunity. Avian cholera in the Canadian Arctic provides a useful case study.
Medical students’ backgrounds often reflect the diversity of local communities, which can allow them more access and trust for vaccination efforts. Bryan Goodchild/UMass Medical School

We’re building a vaccine corps of medical and nursing students – they could transform how we reach underserved areas

One university is showing how the vaccine corps concept can speed up vaccination rates, including launching a large-scale vaccination site staffed by hundreds of students and volunteers.
Maria Saravia, a worker at the University of Southern California’s Keck Hospital, adjusts her mother’s mask before her COVID-19 vaccination. Genaro Molina/Los Angeles Times via Getty Images

Why the next major hurdle to ending the pandemic will be about persuading people to get vaccinated

Getting a vaccine is proving difficult for many older people now, but the mad rush for the vaccine won’t last long. Many people don’t want to get one at all, and that will impede herd immunity.
Joe Biden, then president-elect, received his COVID-19 vaccination in December. Joshua Roberts via Getty Images

Can Biden fix the vaccine mess? An expert says yes

The COVID-19 vaccine rollout has fallen far short of President Trump’s promises. President Biden says he can fix that. Can he?
Vaccine hesitancy is a growing public health problem. Sharon Seretlo/Gallo Images via Getty Images

South Africa’s immunisation record risks being dented by anti-vaccination views

Vaccine hesitancy has resulted in multiple vaccine-preventable disease outbreaks. Research on vaccine hesitancy in South Africa is limited. But growing evidence suggests that it’s becoming a problem.
If too many Americans refuse to take the COVID-19 vaccine, achieving population immunity will be difficult. Paul Hennessy/NurPhoto via Getty Images

Americans have unrealistic expectations for a COVID-19 vaccine

Two in five Americans say they don’t want a COVID-19 vaccine, which is a problem. Finding out what Americans do want from a vaccine might help.
Francesca Passer, a registered pharmacist technician, carefully fills a syringe with the Pfizer-BioNTech COVID-19 mRNA vaccine at a vaccine clinic during the COVID-19 pandemic in Toronto on Dec. 15, 2020. THE CANADIAN PRESS/Nathan Denette

Can COVID-19 vaccinations be mandated? Short answer: Yes

Employers could require their workers to get vaccinated against COVID-19 via both workplace policies and existing laws. Neither option, however, is simple or straightforward.
A nurse at the Royal Free Hospital in London simulates the administration of the Pfizer vaccine on Dec. 4, 2020 to support staff training ahead of the rollout in the United Kingdom. (Yui Mok/Pool Photo via AP)

Which age group — old or young — should get the COVID-19 vaccine first may depend on timing

If supplies of COVID-19 vaccine are initially limited, who should be vaccinated first? A mathematical model shows when and why it’s best to start with the young, and when older people should go first.
A volunteer gets an injection of Moderna’s possible COVID-19 vaccine on July 27, 2020. Moderna announced Nov. 16 that its vaccine is proving highly effective in a major trial. (AP Photo/Hans Pennink)

COVID-19 vaccines: How Pfizer’s and Moderna’s 95% effective mRNA shots work

Two pharma companies have announced early COVID-19 vaccine trial results with over 90 per cent effectiveness. What does that mean for getting back to normal?

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