Poliovirus is highly contagious and infected individuals shed virus in the faeces and from oral secretions, thus the mode of transmission is person-to-person, both via the faecal-oral and the oral-oral routes.
The seroincidence calculator utilises the combination of serum antibody levels (lgG, lgM, and lgA) at a given point in time to estimate the time since seroconversion, which in turn gives an estimate of annual 'force of infection' in the tested population.