TWiV summarizes cases of arbovirus disease during 2019 in the US, and explains a study that estimates infectiousness throughout the SARS-CoV-2 course of infection.
Jeffrey Shaman returns to TWiV to explain how epidemiologists measure SARS-CoV-2 movement among humans, including calculation of the reproductive index, secondary transmission, and what factors affect transmission.
Epidemiologist Adam Kucharski joins TWiV to discuss SARS-CoV-2, including R0, incubation period, herd immunity, asymptomatic infection, superspreaders, children as drivers of pandemics, and how this one will end.
The TWiVerers continue their coverage of the new coronavirus outbreak in China, as the number of cases increase dramatically and the virus begins person-to-person transmission in other countries.
Vincent, Alan, and Kathy continue their coverage of the Ebola virus outbreak in West Africa, with a discussion of case fatality ratio, reproductive index, a conspiracy theory, and spread of the virus to the United States.