COVID is on the rise again, with a peak likely over the holiday season.
Given this, health authorities in a number of Australian states have recommended people start wearing masks again. In Western Australia, masks have been made mandatory in high-risk areas of public hospitals, while they've similarly been reintroduced in healthcare settings in other parts of the country.
So amid rising COVID cases, should you be wearing a mask?
COVID is still a threat
Unfortunately, SARS-CoV-2 (the virus that causes COVID) has not mutated into just a trivial cold.
COVID is not endemic, but is an epidemic virus like influenza or measles, so we can expect waves to keep coming. With this in mind, it's definitely worth protecting yourself - particularly when cases are rising.
What can we do to protect ourselves?
The need is highest in hospitals where thousands of unsuspecting patients have caught COVID during the course of the pandemic and hundreds have died as a result in Victoria alone. Aged care facilities are similarly vulnerable.
Masks work equally by protecting others and protecting you. By visualising human exhalations too tiny to see with the naked eye, my colleagues and I showed how masks prevent outward emissions and how each layer of a mask improves this.
Wearing a mask when visiting healthcare or aged-care facilities is important. Wearing a mask at the shops, on public transport and in other crowded indoor settings will improve your chances of having a COVID-free Christmas.
What about vaccines?
Although the virus' evolution has challenged vaccines, they remain very important. Boosters will improve protection because vaccine immunity wanes and new mutations make older vaccines less effective.
Testing and treatment will also help. There are effective antivirals for COVID, but you cannot get them without a COVID test, and testing rates are very low. Having some RAT tests on hand means you can quickly isolate and get antivirals if indicated.
Finally, safe indoor air is key. Remember that SARS-CoV-2 spreads silently, mainly by inhaling contaminated air. Opening a window or using an air purifier can significantly reduce your risk, especially in crowded indoor settings like schools. A multi-layered strategy of vaccines, masks, safe indoor air, testing and treatment will help us navigate this COVID wave.
- Professor Raina MacIntyre is NHMRC principal research fellow, head of the biosecurity program at the Kirby Institute, and professor of global biosecurity at UNSW.