Substances in database
Example sheet
Database access
Last subscription

Scientific opinion on bluetongue

Undefined

Published on: Wed, 08 Mar 2017 +0100

The performance of different bluetongue control measures related to both vaccination and protection from bluetongue virus (BTV) vectors was assessed. By means of a mathematical model, it was concluded that when vaccination is applied on 95% of animals even for 3 years, bluetongue cannot be eradicated and is able to re-emerge. Only after 5 years of vaccination, the infection may be close to the eradication levels. In the absence of vaccination, the disease can persist for several years, reaching an endemic condition with low level of prevalence of infection. Among the mechanisms for bluetongue persistence, the persistence in the wildlife, the transplacental transmission in the host, the duration of viraemia and the possible vertical transmission in vectors were assessed. The criteria of the current surveillance scheme in place in the EU for demonstration of the virus absence need revision, because it was highlighted that under the current surveillance policy bluetongue circulation might occur undetected. For the safe movement of animals, newborn ruminants from vaccinated mothers with neutralising antibodies can be considered protected against infection, although a protective titre threshold cannot be identified. The presence of colostral antibodies interferes with the vaccine immunisation in the newborn for more than 3 months after birth, whereas the minimum time after vaccination of animal to be considered immune can be up to 48 days. The knowledge about vectors ecology, mechanisms of over-wintering and criteria for the seasonally vector-free period was updated. Some Culicoides species are active throughout the year and an absolute vector-free period may not exist at least in some areas in Europe. To date, there is no evidence that the use of insecticides and repellents reduce the transmission of BTV in the field, although this may reduce host/vector contact. By only using pour-on insecticides, protection of animals is lower than the one provided by vector-proof establishments.

© European Food Safety Authority, 2015

Scientific opinion on bluetongue


Last Tweets

06/06/2016 - 11:11
Nuovo componente inserito: Simmondsia Chinensis (Jojoba) Seed Oil https://t.co/mGvGLRQ05k
29/05/2016 - 10:04
Nuovo componente inserito: Linum Usitatissimum seed oil Error
27/05/2016 - 16:38
Nuovo componente inserito: Soybean oil https://t.co/9prxB7xyiu

NOAEL-crew

Project coordinator

Content revision

Toxicological datasheet creation

Website Administration

Subscriptions & Contacts

To get more info about the NOAEL project, go to FAQ section or contact Roberto Narducci at this address:
 
infoATnoaelproject.it or robymagnoATgmail.com
 
For info about subscription costs click the following link or contact Federica Cambiganu:
 
federica.cambiganuATpin.unifi.it
+390574602511
PIN s.c.r.l. - Piazza Giovanni Ciardi 25, 59100 - Prato