International arrivals into Australia will still need to go into hotel quarantine even if they have had a COVID vaccine.
The main reason for this is that the vaccination is not guaranteed to stop a person from carrying, and therefore transmitting, the virus.
The vaccination appears to only stop most people from being “affected” by the virus.
It is also stated that the protection doesn’t kick in until at least 12 days after getting the vaccination.
Vaccination Effectiveness must be viewed with caution.
For example this chart shows the Oxford-AstraZeneca vaccine to be 70% effective, but this rises to 90% after the second dose.
You will find more infographics at Statista
Why is the second vaccine dose needed?
Most vaccines require a 2nd booster dose to work effectively. An example of this is the very common MMR (Measles, Mumps and Rubella) vaccine.
The first dose only gives about 40% protection, but after the second dose, this protection rises to 96%.
The above information is from a report on the BBC.
That report also stated: According to Pfizer data published in December 2020, the Pfizer-BioNTech vaccine is roughly 52% effective after the first dose.
As you can see from the above chart, the Pfizer vaccine shows a 95% result, presumably after the 2nd dose, while the AstraZeneca vaccine shows 70%, but that is after the first dose.
Should the figures be:
| Vaccine | At 1st Dose | At 2nd Dose |
| Pfizer | 52% | 95% |
| AstraZeneca | 70% | 92% |