CLEAN : Four vaccine candidates in development for new coronavirus says WHO

The video emphasizes the importance of global solidarity in combating COVID-19, highlighting the need to fight the virus as a united humanity. It discusses the rapid progress in vaccine development, with several candidates expected to enter human trials soon. The video also covers the tracking of transmission chains and the importance of managing risks calmly to ensure events can continue safely without causing panic.

What does the speaker mean by 'fighting against this common enemy'?

What is the significance of tracking transmission chains of the virus?