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See also below FMD Vaccine and virus challenge at the time of vaccination and the paragraphs from warmwell's front page about the EU rules on vaccination to live that involve the moving of vaccinated animals, meat and milk.


The anti-vaccination farmers are quite right. Using vaccination causes great unfairness and it is this that we must address - after we have vaccinated.

Warmwell has posed these four questions to various people knowlegeable about animal health, and foot and mouth in particular. None has yet been answered in a way to defend the 2003 EU Directive on these few points..

In this outbreak - and very differently from 2001 - no one quoted in the UK media seems seriously to doubt that vaccination works but there still seems confusion among those who should know better about whether vaccinated animals can be differentiated from infected ones - and still worrying misunderstanding about "carriers". (warmwell addressed some major questions about vaccination on Sept 14th its front pages and here.) But in the end, the rubbishing of vaccination in the UK all boils down to how very unfair it is for the farmers that, if their animals are vaccinated and thus kept safe not only from disease but from the risk of infecting neighbours, they lose markets for their meat for six months. And I see their point (or would do if the alternative were not so grotesque)

I can't work out why the Reimer Böge, Elisabeth Jeggle and Albert Jan Maat amendment attempt in 2003 - getting the six months reduced to three - was thrown out. Even with the perceived risk of virus remaining in vaccinated animal products it's hard to see any justification for the extra three months.

I asked: 1. Can anyone else see what the justification was? (No one could.)

So the sticking point for all the anti-vaccinating people is not only the six month wait before trading status can resume but also the fact that their animals become financially valueless because of meat treatments that have to be made for the export market. And that breeding stock and pedigree animals can't be exported to the EU.
Thanks to a derogation, vaccinated meat and milk - if destined for the home market - is allowed to be treated no differently from the non-vaccinated equivalent - but even for the home market, this selling of non treated meat and milk is not allowed to happen until the end of Phase 3 - ie in theory at least the full six months i.e. the time after the completion of the survey and the classification of holdings (by differential and serological testing) until the foot-and-mouth disease and infection status is recovered.

And the justification for meat treatments - cooking and deboning and so on - is that, although very little research has actually been done, it is thought that virus can remain in subclinically infected animals and survive in "organ systems which are unaffected by pH changes" It is concluded that "Fresh and frozen carcasses pose potential risks in FMD virus" (http://www.fao.org/AG/AGAINFO/commissions/docs/germany05/App25.pdf) This paper - looking only at pig meat, surprised me by its odd and simple sounding conclusions.

I asked: 2. If vaccinated pigs never become carriers, how can they be thought to be carrying virus? The risk - compared to the real risks every day of the virus emerging somewhere - seems absurd. Am I wrong? Can any subclinically infected but vaccinated animals really pose a risk if all this complicated heating and deboning isn't done?
(So far, no one has argued that they can. But, in any case, screening of all vaccinated animals has to take place according to EU Directive Article 57. If, when the compulsory differential testing finds antibodies to wild infection, the animal would never reach the food chain, anyway.)

And the other huge problem for the pedigree people and the breeders is that they say that their animals would become instantly valueless. One farmer quoted on the BBC even said that they cannot be taken out of the zone and sold on. That seems not to be true from my thorough reading (reluctant) of the Directive.

I asked: 3. If - to be doubly safe - a negative test for FMD antibodies were carried out before vaccination, is there any scientific reason why vaccinated animals should not be sold out of the Member State after disease status is regained?
(The scientific answer to this is a resounding No)

"Movement of vaccinated animals of susceptible species after the recovery of the foot-and-mouth disease and infection-free status The dispatch from one Member State to another Member State of animals of susceptible species vaccinated against footand-mouth disease shall be prohibited."

I asked: 4. Finally, what do we make of the significance of Article 62? Could this be 'wriggle room' for the EU to allow the six months to be far less if all testing seemed OK?
(Looks very much like it. The six months nonsense may well not be enforced to the letter when it becomes obvious we need to vaccinate, and fast.)

On page 32 of the Directive (Article 62) "By way of derogation from Article 61 it may be decided in accordance with the procedure referred to in Article 89(3), to withdraw the restrictions applied in accordance with this Directive after the clinical and serological survey provided for in Article 56 and the measures provided for in Article 57 have been completed and confirmed the absence of foot-and-mouth disease virus infection. "
(Article 89 (3). "Where reference is made to this paragraph, Articles 5 and 7 of Decision 1999/468/EC shall apply, the period laid down in Article 5(6) of that Decision shall be set at 15 days.")
(The period referred to in Article 5(6) of Decision 1999/468/EC was set at three months.)

These points and more will be raised at the ELA conference in Brussels on October 17th this year, (2007)


FMD Vaccine and virus challenge at the time of vaccination Return to warmwell.com

Written for warmwell in September 2007

FMD Vaccine and virus challenge at the time of vaccination

By Dr Ruth Watkins BSc Hons, MSc, MBBS, MRCP, MRCPath.

When a killed vaccine is used in an outbreak situation including FMD - and FMD vaccine provides solid protection from infection with one dose of the high potency vaccine - there are occasional instances when either the vaccinee has been exposed to virus just before vaccination or in the first few days afterwards.

If the vaccine is given around the time of infection particularly in the few days after exposure, it can modify the infection. The immune response to the vaccine somewhat precedes that to the virus which is more slowly getting underway early in infection because the vaccine is a relatively large dose of highly immunogenic adjuvented virus protein (the structural virus proteins but not the non-structural virus proteins are included in the vaccine). The high potency vaccine is designed to produce a good level of protective anitbody by 10 days after the inoculation is given.

If the incubation period should be changed by prolonging it, or the exhibition of any symptoms and signs should be diminished, and virus clearance delayed, this is quite normal in human and animal virus infections when killed vaccines are used. It is not an attribute special to FMD vaccine. To suggest that "this is what happens with foot and mouth vaccine" just displays ignorance of infectious disease in general and vaccination in particular. (This is one of the problems of scientists in labs; they usually have no specialist training generally in infection or virology, nor any experience in the field. Their focus is narrow upon their subject of research, valuable illuminating and relevant though this might be).

If vaccination was used on a farm where there was - unknown to the vets- infection early in the incubation period, or exposure a few days after vaccination so that a few infections modified by vaccine occurred, this farm would be detected on screening during surveillance. All animals infected by the virus make antibodies to the non-structural proteins and so the the antibody test to these would be positive (The test is negative if the animals are only vaccinated as they can only have antibodies to the proteins presented in the vaccine, the structural proteins.). The test for anitbodies to non-structural proteins is validated on a herd or flock basis.

All the animals on the farm where any tested positive to non-structural antibodies would be culled as the premises would be classified as an infected premise on screening. (As per EU Directive Article 57 paragraph 3 p 29)

Even so, the virus infection would be limited on that farm. 5 days or so after vaccination antibodies to disease have developed so the virus cannot continue the chain of infection. It will not be able to spread -neither on that farm nor into the vaccinated neighbouring farms.

It might be thought then, that killing the animals on such a farm to be entirely gratuitous. However FMD can give rise to an infectious carrier state particularly in cattle when the virus may be shed from the oropharynx intermittently making it hard to reliably detect such animals. The antibody test to distinguish animals infected by virus may not be relied upon to clearly discriminate infected from vaccinated animals on a single animal basis with reliable accuracy in every individual case. Also a farm on which there have been infections must be cleaned and the dung appropriately disposed of.

FMD vaccinated animals on uninfected farms are the ones that should not be destroyed. The possession of protective neutralising antibody prior to infection changes the whole outcome if a vaccinated animal should be exposed to FMD. If a vaccinee should somehow come across the virus (which is unlikely in a vaccinated herd unless there is exposure to infected deer or fomites) it is either completely protected against infection ( the commonest case - which is why FMD vaccine is so good) or, if infection should occur, it would be limited and the animal does not become an infectious carrier.

Antibody to killed vaccines will eventually fade, and become undetectable, so that if FMD remained in the environment vaccination would have to be boosted perhaps annually or maybe more frequently in pigs. In actual practice of using FMD vaccination to control an outbreak this rarely prooves necessary as the infection has been eliminated by one round of vaccination.

( In poor countires where FMD is unchecked infected animals can have complications and sustain injury such as myocarditis - particularly associated with serotype O - and oxen for example can be rendered useless from this complication of FMD infection. Vaccinated animals do NOT sustain injury from myocarditis.)

The rules in the UK on FMD vaccination have clearly been formulated to make it as unlikely as possible that we should use vaccination. They are bureaucratic rules to protect the UK and EU meat industry. Unfortunately, the stakeholders meetings on the subject of vaccination held around the country took place not to consult and listen but rather to be able to say that consultation has taken place. There is no obligation on the officials to take any notice whatsoever of anything said or submitted by those who disagree with the policy.


September 17 ~ Vaccinated animals can be moved within national borders

September 17 ~ Although the paragraphs on meat from the vaccination zone make one's head spin, they are not quite as complicated as they seem.

September 17 ~ Misinformation about vaccinates

 

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

 

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