Acholeplasma laidlawii

Aeromonas salmonicida

African Horse Sickness Virus

African swine fever virus

Aleutian Disease Virus

All Ehrlichia species

All Encephalitozoon species

Anaplasma centrale

Anaplasma phagocytophilum

Anaplasma platys

Ascaris lumbricoides / Ascaris suum

Aspergillus fumigatus