Top 3 COVID-19 vaccine questions – Lockdown and transmission after COVID-19 vaccines, and new COVID-19 strains

Top 3 questions

1. Why do people who have received their COVID-19 vaccines have to be in lockdown?
2. Can I transmit the COVID-19 virus to someone after being vaccinated?
3. Are new COVID-19 strains likely to impact the effectiveness of the vaccines?