Contact Tracing Apps Vs. Boots On the Ground

The World Health Organization has come out to say that contact-tracing applications cannot replace old-fashioned interviews and surveillance, in getting ahead of the Covid-19 pandemic. With governments, including Malaysia's, beginning to encourage the public to use these apps to supplement virus mitigation efforts, we speak to Benjamin Cowling, Professor of Infectious Disease Epidemiology at the University of Hong Kong, about how effective these apps are in helping to combat Covid-19.