Aladár Aujeszky (11 January 1869 Pest – 9 March 1933 Budapest) was a Hungarian veterinary pathologist, professor of bacteriology and microbiologist, noted for his work on pseudorabies.

[1][2] Pseudorabies (also known as PRV, Aujeszky's disease, infectious bulbar paralysis, or mad itch), is caused by a virus with icosahedral symmetry and belongs to the subfamily Alphaherpesvirinae within the family Herpesviridae.

In 1909 Weiss found that pigs are the reservoir host of the virus, and that, even though other species such as cattle, sheep, cats, dogs, goats, horses, raccoons, skunks, mice, and rats may transmit the disease, the virus completes its life cycle only in pigs.

From 1907 to 1933 he worked in the Department of Bacteriology of the Royal Academy of Veterinary Medicine.

[3] He was the author of 528 publications and director of the Institute of Microbiology at the Veterinary School in Budapest.