Bluetongue Outbreak Reported in Poland

Mon, 27 Oct 2025 17:58:17 GMT

Bluetongue virus (BTV) continues to spread across Europe. Today, the World Organisation of Animal Health announced that Poland reported an outbreak of Bluetongue disease near the Czech border.

Bluetongue is an infectious viral disease spread by biting midges (Culicoides spp.) affecting sheep, cattle and other ruminants. It is not contagious from animal-to-animal and does not affect human health. Infections range from mild to severe depending on the species affected. Sheep are most significantly affected by BTV, while most cattle infections are asymptomatic.

Over 27 serotypes of BTV have been identified, each developing differently in its host. Immunity against one serotype provides no protection against another, making vaccination strategies complicated. The current outbreak is of serotype 3, which has been detected in many European countries since fall 2023.

This serotype has also been reported and established in the U.S. along with several others. Notably, serotype 8, which dominated in Europe from 2007 to 2010 and has high virulence with the potential for transplancental transmission in cattle, has never been reported in the U.S..

Clinical signs in cattle are rare; however, the following may be observed:

Fever
Increased respiratory rate
Teary eyes
Salivation
Stiffness
Oral ulcers
Ulcerative dermatitis

Further, susceptible cattle infected during pregnancy can abort or deliver abnormal calves.

Animals infected with BTV typically develop a serologic response within one to two weeks of exposure. There is no known cure for bluetongue; infected animals should receive supportive care to prevent secondary infection.