==Target organs==
===Eye involvement===
{|class="wikitable" style="width:1000px"
|-
! style="width:16%| !!style="width:14%|Virus!!style="width:14%|Bacteria and /<br>Rickettsia!!style="width:14%|Protozoa!!style="width:14%|Nematode!!style="width:14%|Trematode!!style="width:14%|Cestode
|-
!Conjunctivitis