The authors concluded that conjunctival inoculation resulted in a mild lung infection compared to the trachea inoculation. 51  Unfortunately, no histology was performed on the eye during the infection, and given the very transient level of virus found in the conjunctival samples, infection or inflammation probably did not occur. If there was infection of the ocular surface, then conjunctivitis and perhaps keratitis would be expected to be manifestations of the disease. This study does suggest, at least for relatively large inocula (the authors used 1 × 106 50 per cent tissue‐culture infectious doses), that viral particles on the eye can travel to the lung but that they are either reduced in their virulence or the numbers that reach the lung are very low, and so the resulting infection was very mild.