Before revision:  We show that the use of the " top-hat " formulation for steady speech flows can underestimate infection probabilities by a factor of 2-3. We propose an alternative method of estimating viral ingestion that includes exposure through the eyes and mouth , to provide more realistic estimates of the risk of infection .
After revision:  We show that the use of the " top-hat " effect. Unequal conversation is shown to significantly increase the risk of infection .