Schmallenberg Virus Re-Emerges in Dairy Herds, Linked to Milk Drop Syndrome

The RVLs noted a recent re-emergence of the virus, urging caution in interpreting single serology results, as these alone are not sufficient for an SBV diagnosis. However, paired serology tests have confirmed recent infections in some cases, coinciding with the clinical symptoms, suggesting SBV was the cause.

Farmers are advised to be vigilant for the described symptoms and consult veterinary practitioners if they are observed.

Background on Schmallenberg Virus (SBV)
Schmallenberg virus was first identified in 2011 near the German town of Schmallenberg, with early cases reporting fever, diarrhoea, and milk yield reduction. SBV was first detected in Ireland in late 2012, with outbreaks in the south and southeast.

In cattle, SBV is linked to fever, milk drop, abortion, and deformed foetuses. In sheep and goats, the virus can cause abortion and severe congenital deformities, including limb malformations and brain abnormalities. The critical infection period for deformities is between 28-56 days in sheep and 62-170 days in cattle.