Manufacture of a GMP SARS-CoV-2 challenge agent

In the current COVID-19 emergency, a controlled SARS-COV-2 human infection model (CHIM) has the potential to accelerate the understanding of pathogenesis, induction of immunity and immune mechanisms of resistance to disease, as well as a means to test novel diagnostics and treatments, especially between waves of the pandemic, when occurrence of natural disease is relatively uncommon. A large number of SARS-COV-2 vaccine candidates are at various stages of development internationally including those which have recently entered mid-late stage clinical testing in field studies. In order to make the greatest public health impact, there is an urgent need to select the most promising vaccines in the shortest possible timeframe. In addition, human infection challenge can contribute to the identification of correlates and mechanisms of protection against infection and shedding of virus in vaccinated volunteers. Finally, the model may be useful in the determination of the durability of protection in seropositive individuals with documented prior wild type infection. This proposal is a dose titration study to generate two GMP challenge agents and establish the safety of a wild-type SARS-COV-2 controlled infection in the upper respiratory tract of young healthy volunteers that will allow swift and robust assessment of vaccine efficacy.