Steven McOrist

usuarios_autor_invitado Author

12 Articles

Steven McOrist graduated as a veterinary surgeon and worked at diagnostic laboratories for farm animals in Australia, then he transferred to a PhD in the U.K. and continued as the senior researcher and team leader in the pig ileitis program. This team was the first to successfully culture the aetiological agent, to name the causative agent Lawsonia intracellularis, the first to fulfill Koch’s postulates. He later served as the director of veterinary and technical services for the Asian-Australian agribusiness group, QAF (Bunge) Industries, focusing on swine production. He has worked in academia with Associate Professorship roles in the USA and UK, where he taught microbiology, enteric diseases and swine medicine. He returned to full-time pig and consultancy work in Asia-Pacific, based in Hong Kong and Melbourne. He performs technical management roles and consultancies with Australian, Chinese, Filipino and European pig agribusiness groups. He has published extensively on pig diseases, including guidebooks on pig diseases and the standard textbook, Diseases of Swine.

Steven McOrist 12 Articles

Clinical case: Abortion outbreak - an old favourite returns

S. McOrist

The “normal” sporadic and unexplained abortion rate in pigs is approximately 1 to 2 % of pigs that are mated and achieve a pregnancy.

Clinical case: Post-weaning diarrhoea outbreaks in Eastern Europe

S. McOrist

D. Spiru

F. Belean

The pig farm management team in charge of the post-weaned piglet nursery areas on these wean-to-finish sites has found serious problems with diarrhoea in recent batches of piglets arriving from the breeding farms.

Health Article

Clinical case: Mortality surge in integrated farm system in south-east Asia

S. McOrist

The pen and farm charts indicated a rapid jump to 40 % mortality in several finisher sheds over one to 2 weeks.

Health Article

PED (Porcine Epidemic Diarrhoea) on the rampage

S. McOrist

Control of outbreaks on problem farms in Asia remains an attempt to raise herd immunity by use of live virus feedback material. However, the current outbreaks have shown only transient herd immunity with these programs.

Health Article

Clinical case: FMD in a pig farm

S. McOrist

On the finisher sites, the farmer noticed that the growing pigs in all the farm sheds had become dull and lame.

Health Article

Vaccination failures in the control of PCV disease

S. McOrist

The first cause of PCV vaccine failure is the purchase and use of generic vaccine of low quality and titre, but the exact cause of the failures can occur in various forms.

Health Article

Escherichia coli infections in pigs (1 of 2)

S. McOrist

This article will focus on clinical signs of some E coli infections: neonatal colibacillosis, post-weaning colibacillosis diarrhoea and oedema disease.

Health Article

Escherichia coli infections in pigs (2 of 2)

S. McOrist

Post-weaning colibacillosis and oedema disease are common global infection among farmed pigs – these strains of E coli appear to be "embedded" in most pig farms, so elimination is not a current option. Vaccination of sows or gilts with ETEC vaccines has no effect on post-weaning E. coli infections.

Health Article

PED technical update: evolution of virus and clinical syndromes

S. McOrist

The current situation for PED is that of continual occurrence of moderate to severe outbreaks in many pig farms, across Asia, USA and elsewhere, on both naïve farms and those that have suffered previous episodes.

Health Article

Oedema Disease case study

S. McOrist

At autopsy of some affected pigs, the soft gelatinous oedema was evident in the eyelids, but also in the meso-colonic area of the spiral colon.

Health Article

Clinical case: ASF on a Chinese pig farm

S. McOrist

This clinical case describes how, after discovering large numbers of dead and dying pigs in the sheds over a 4-day period, an expert team of veterinarians diagnosed African Swine Fever.