Harvard Medical School's Karan on Global Vaccine Rollout

The video discusses global vaccine distribution challenges, emphasizing the need for equitable access to achieve herd immunity. It evaluates the risk-benefit analysis of vaccines, particularly AstraZeneca, and addresses concerns about side effects. The efficacy of Chinese and Russian vaccines is considered for emerging economies, highlighting the importance of any vaccine over none. The video also explores the potential risks of mixing different vaccine types and clarifies the difference between vaccine efficacy and effectiveness.

Discuss the efficacy rates of different vaccines mentioned in the text.

What are the potential risks of mixing different types of vaccines?