#1. Do you still need a vaccine if you have already had COVID-19?
Antibody responses after COVID-19 infection are highly variable. Some people’s immune systems do not mount a great response to the virus on their own. This often opens the door to more variants and repeated infection cycles in the population. More: https://blog.csiro.au/how-do-vaccines-work/.
#2. Are both the Pfizer and AstraZeneca vaccines effective against the Delta variant?
A peer-reviewed study in The New England Journal of Medicine showed that after two doses: Pfizer-BioNTech vaccine is 85.3 to 90.1% effective against symptomatic disease caused by Delta. Oxford-AstraZeneca vaccine is 61.3 to 71.8% effective against symptomatic disease caused by Delta. More: https://blog.csiro.au/vaccines-effective-delta-variant/.
#3. What is the best way to protect yourself against COVID-19?
At first, it was thought that SARS-CoV-2, the virus that causes COVID-19, was a disease of the airways and lungs. That could then lead to life-threatening respiratory symptoms. As the pandemic progressed, it became clear that the virus can affect multiple organs. This includes neural and cardiac tissues, sometimes causing widespread and permanent damage. More: https://blog.csiro.au/covid-19-treatments/.
#8. What are some things behavioural scientists suggest to do in lockdown?
The main things we can do to protect our wellbeing during times of uncertainty is to take steps towards controlling what we can control. Maintaining a regular routine, staying active, and avoiding too much alcohol will help to protect our physical and mental health including sleep quality. More: https://blog.csiro.au/lockdown-tips/.
#9. Can people with COVID-19 who don’t show symptoms still shed the virus signal in their faeces?