They consider the potential for long term harm, of any kind, and the possible benefits and then advise. Rhinovirus 39 is unpleasant, but neither traumatic nor d

They consider the potential for long term harm, of any kind, and the possible benefits and then advise. Rhinovirus 39 is unpleasant, but neither traumatic nor dangerous in healthy subjects. There is also no issue of zoonotic transmission leading to potential for dangerous mutations within a reservoir. Edit: Rhinovirus 39 is also incredibly well studied, cheap, and easy to inoculate a subject with.