In 1906 he was the first person to isolate the Campylobacter species of bacteria, and due to this made major advances in public health.
[2] For the first few years after leaving school he worked on his father's farm but in October 1874 he entered the Dick Veterinary College in Edinburgh from whence he graduated in April 1876.
He lodged at the college at 8 Clyde Street[3] (now the site of Edinburgh's main bus station).
The McFadyean building at the Royal Veterinary College (which today houses the London BioScience Innovation Centre) was named in his honour.
His son, Sir Andrew McFadyean was knighted by King George V in 1925 for his work in the diplomatic service.