Statistics from Altmetric.com
APHA disease Surveillance report headlines
Significant pasture challenge from infective helminth larvae leads to heavy parasite burdens in cattle and sheep
Colisepticaemia in piglets
Egg peritonitis and Marek’s disease in laying hens
Update on ovine abortion
Highlights from the scanning surveillance network
Several outbreaks of parasitic gastroenteritis (PGE) were diagnosed in APHA Veterinary Investigation Centres (VICs) in October. These probably reflect the change from the hot dry weather earlier in the summer to the milder wetter conditions that have followed in recent months, which has resulted in a high pasture larval challenge on farms.
In a case reported by the APHA Carmarthen VIC, six of a group of 60 yearling calves on a dairy farm were found dead over three days, with the others in the group reported to be in poor condition and diarrhoeic.
A postmortem examination by the farm’s practitioner identified marked inflammation of the abomasal mucosa (Fig 1) which had diffuse reddening and multifocal pale nodular lesions. A worm egg count of 400 trichostrongyle eggs per gram was identified in liquid faeces. Salmonellosis was ruled out by bacterial culture.
The APHA Starcross VIC investigated disease in five-month-old weaned dairy calves in another outbreak. One of a group of 84 calves exhibited malaise, dehydration and collapse before death. The calves had been treated with a pour-on anthelmintic eight weeks previously.
A hyperplastic nodular thickening of the abomasal mucosa was again found postmortem, with 400 trichostrongyle-type eggs per gram identified in liquid faeces. Diagnosis was confirmed by a total worm count: 800 adult Ostertagia species and 200 immature worms were present in the abomasal content. This shows the benefit of prompt investigation of disease as it indicated a likely significant worm challenge for the remainder of the group and effective treatment and preventive action could therefore be taken.
About this report
This report is produced each month by the APHA Surveillance Intelligence Unit …
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.