The emergence of variants of concern in late 2020 marked a shift in the COVID-19 pandemic.
The Delta variant: What it is, where it came from, why it's different and whether COVID-19 vaccines can prevent it.
The government says hotel quarantine is 'serving Australia very well'. But if you look at the leaks as a proportion of COVID-positive returnees, it's a different story.
Sustained surveillance for disease outbreaks at global hot spots may be the key to preventing the next pandemic.
A more coordinated effort by scientists, stakeholders and community members will be required to stop the next deadly virus that's already circulating in our midst.
Ritchie B. Tongo/EPA/AAP
Only about 1% of the population was vaccinated against COVID when this outbreak started.
You only have to prevent one case, which could have otherwise led to community spread and lockdown, for such a scheme to pay for itself many times over.
The response to the crisis in India speaks to the complexity of public health decision-making.
The amount of risk from overseas arrivals depends not just on Australia's vaccination rates, but also on the particular circumstances of the country from which people are travelling.
Sequencing the genetic code of virus samples taken from COVID-19 patients reveals how SARS-CoV-2 is spreading and changing.
The US lags in testing coronavirus samples from COVID-19 patients, which can help track the spread of the virus and the emergence of new variants. But labs are ramping up this crucial surveillance.
One of Tanzania’s approaches to managing the spread of the new coronavirus is through prayer.
Photo by STRINGER/AFP via Getty Images
The pandemic will not end for anyone, anywhere until it is controlled in every country. Tanzania’s approach will make it that much harder for normality to return.
Simon Bullard/AAP Image
It could easily be another 12 months until Australians are fully vaccinated. While we've had great success fending off the coronavirus, our leaders need to work even more closely to prevail this year.
Ten years ago, we feared Tasmanian devils would be wiped out by a bizarre infectious facial cancer transmitted by biting. But new genetic analysis shows they are evolving to live with the disease.
If you've tested positive for COVID-19, a public health officer will call you to interview you. It can be confronting – but it's important to answer the contact tracer's questions as best you can.
There’s valuable data on the spread of COVID-19 in this wastewater.
Montgomery County Planning Commission
As the world waits for vaccines against COVID-19, testing wastewater can give communities and smaller locales, such as school districts, valuable signals about infections trends.
What will happens when students return home for Christmas?
If nothing is done to reduce university-based Covid-19 infections, each infected student is likely to infect one other person in their household during the winter holidays.
People wear face masks to help control the spread of COVID-19 as they walk along a street in Montréal on Oct. 18, 2020.
THE CANADIAN PRESS/Graham Hughes
The Great Barrington Declaration's advocacy for naturally acquired herd immunity to COVID-19 amounts to a global chickenpox party: naive and dangerous.
The COVID-19 new normal might be here for quite some time.
SolStock/E+ via Getty Images
As ready as you are to be done with COVID-19, it's not going anywhere soon. A historian of disease describes how once a pathogen emerges, it's usually here to stay.
Even if some places reach herd immunity, the virus is unlikely to disappear.
The focus, for some time, has been on new daily case numbers. But what if we are looking at the wrong figure? We should focus on the average number of cases "under investigation" over the last 14 days.
We're likely to see clusters of cases pop up and outbreaks that are hard to stamp out. But we can't stay in lockdown forever. We have other options.
Areas with the highest levels of mortality in the first wave do not show a significant resurgence of cases this time around. But why?