Expert: Never forget real enemy in pandemic

Outbreaks will only worsen if countries "do not contribute to the research and development of new public health policies," said Elena Reyes Rueda, a public health specialist from the National Autonomous University of Mexico.

Origin-tracing is a complex scientific undertaking, so there should be more collaboration between governments to successfully identify the virus' hosts and the routes of transmission, she said in a video call with Xinhua.