Reaction as global stock markets rocket on vaccine hopes

The video discusses the positive impact of a 90% effective vaccine on the stock market, particularly benefiting sectors hit hard by the pandemic, such as airlines and energy companies. The unexpected announcement from Pfizer has led to increased optimism, with expectations for further updates from other companies like Moderna and AstraZeneca. The video also covers the challenges of vaccine distribution, including production limitations and the need for herd immunity, while highlighting the UK's preparedness with pre-ordered doses.

What did Doctor Fauci say would be an acceptable effectiveness rate for a vaccine?

What challenges regarding vaccine production are mentioned in the text?