Bluetongue in Cattle: Vaccination Urged Before Grazing Season 2026
Recent reports indicate a rise in cases of bluetongue (BTV3) among cattle in the Värmland region of Sweden, prompting a call to action from Gård &. Djurhälsan. The organization is urging livestock producers to monitor their herds for reproductive issues and to prioritize vaccination before the upcoming grazing season. This development follows confirmed cases on three farms, with samples from an additional calf currently undergoing analysis at the Statens veterinärmedicinska anstalt (SVA).
Bluetongue is a viral disease transmitted to animals via Culicoides midges, commonly known as biting gnats. Even as not directly transmissible between animals, the current cases in Värmland are believed to stem from infections that occurred in the womb during the 2025 midge season. This means that calves are exhibiting symptoms as a result of their mothers being infected last summer or fall.
Understanding the Current Situation
To date, five cases of bluetongue have been confirmed across three farms in Värmland. Investigations into one affected herd revealed a high proportion of adult animals possessing antibodies against the virus, suggesting widespread transmission during the previous season. This underscores the potential for significant spread, even if not immediately apparent. The farms affected had not implemented vaccination protocols for their cattle.
The situation is complicated by the fact that the extent of the spread for the 2026 season remains uncertain. Several factors will influence transmission rates, including the population of Culicoides midges, weather conditions (warmer temperatures favor midge activity), wind patterns, animal movement, and, crucially, vaccination coverage in affected areas. Gård & Djurhälsan emphasizes the importance of proactive vaccination to build herd immunity and protect pregnant animals and breeding bulls.
Recognizing the Signs of Bluetongue
Early detection is crucial in managing potential outbreaks. Livestock owners should be vigilant for several key symptoms, including:
- Abortions: Loss of pregnancy.
- Empty Cows: Cows that fail to conceive.
- Weak or Stillborn Calves: Calves born in poor condition or without signs of life.
- Neurological Symptoms: Signs such as blindness or unusual behavior in calves.
If any of these symptoms are observed, prompt consultation with a veterinarian is recommended for diagnosis and potential testing. Gård & Djurhälsan notes that post-mortem examinations have revealed a consistent finding in affected calves: a partial or complete absence of the cerebrum (brain).
Vaccination: A Key Preventative Measure
Vaccination remains the most effective strategy for preventing bluetongue. Current recommendations are as follows:
- Animals vaccinated twice in the previous year require a booster dose.
- Unvaccinated animals require two doses, administered three weeks apart.
- Full protection is achieved approximately six weeks after the initial dose.
It’s vital to plan vaccination well in advance of the grazing season to ensure adequate protection. Tidningen Husdjur reports that updated recommendations now extend to areas further north, reflecting a broader potential risk.
The Broader Context of Bluetongue in Europe
While this report focuses on Värmland, Sweden, bluetongue is a concern across Europe. The disease has been circulating in several countries, and outbreaks can have significant economic consequences for livestock farmers. The European Food Safety Authority (EFSA) and the European Centre for Disease Prevention and Control (ECDC) continuously monitor the situation and provide risk assessments and guidance to member states. EFSA’s website provides detailed information on the disease, its spread, and ongoing research efforts.
Registration and Surveillance
Authorities are emphasizing the importance of registering vaccinations with Jordbruksverket (the Swedish Board of Agriculture). Past outbreaks were hampered by difficulties in accurately assessing the level of vaccination coverage due to incomplete reporting. Accurate data is essential for effective surveillance and informed decision-making regarding control measures. Jordbruksverket is implementing a simplified e-registration system for vaccinated cattle in February 2026 to streamline this process.
What to Expect Moving Forward
The long-term outlook for bluetongue in Sweden and Europe remains uncertain. The SVA is conducting further investigations to determine the source of the current outbreak in Värmland – whether it represents a latest introduction of the virus or local overwintering. It is likely that calves born in 2026 will also be affected by infections contracted during the 2025 midge season, but the extent of this impact is difficult to predict.
Continued vigilance, proactive vaccination strategies, and robust surveillance systems are essential to mitigate the risk of bluetongue and protect livestock populations. Livestock owners should maintain close communication with their veterinarians and stay informed about the latest updates and recommendations from Gård & Djurhälsan and Jordbruksverket.