Highly Pathogenic Avian Influenza H5N8 in Europe

Hello Readers,

As most of you I’m sure are aware, there has been a new strain of avian influenza infecting birds in Europe and has recently moved to Wales. I composed some questions that I wanted responses to and did some research into the answers. In the veterinary profession our vets work to ensure human health is taken into account when working towards good animal health.

Where has this originated from?

According to ‘Reuters’ and ‘Fox News’ the first case of the H5N8 strain of avian flu was detected in Denmark on a poultry farm. About one-third of 30 ducks at a farm north of Copenhagen were killed by the same virus that had been found in Denmark in wild birds.

http://uk.reuters.com/article/us-health-birdflu-denmark-idUKKBN13G0WI

How is it spread between birds?

Infected birds can shed avian influenza A viruses in their saliva, nasal secretions, and feces. Susceptible birds become infected when they have contact with the virus as it is shed by infected birds. They also can become infected through contact with surfaces that are contaminated with virus from infected birds. Domesticated birds (chickens, turkeys, etc.) may become infected with avian influenza A viruses through direct contact with infected waterfowl or other infected poultry.

https://www.cdc.gov/flu/avianflu/avian-in-birds.htm

How are these strains changing so quickly?

As well as the mutations we are familiar with such as bases being substituted, there is another type of mutation; viruses exchange information with one another. These mutations can occur when different kinds of viruses come into contact with one another in a single host. Hypothetically, for example, a virus that is easily spread from person to person could exchange genetic information with a highly pathogenic strain of avian flu virus, creating a new strain that can be transmitted easily among humans.

The potential for this type of mutation to occur is greatest when there are many opportunities for the virus to multiply—in large flocks with many infected birds. The virus can spread more quickly in crowded conditions, and birds in high-density flocks may be more susceptible to the disease because the stressful conditions may weaken their immune systems.

Viruses have more opportunities to exchange information where these flocks are in close contact with humans or other domestic animals, raising the potential for a human or a pig, for example, to serve as a host for two flu viruses that can exchange genetic information and become more harmful to humans.

http://www.birds.cornell.edu/birdflu/what-you-should-know/q-a/q-a-10 

Will this put human lives at risk?

WHO write “Human infection with the H5N8 virus cannot be excluded, although the likelihood is low, based on the limited information obtained to date. It should be noted that human infection with H5N6 of related clade 2.3.4.4 has already occurred. WHO will re-assess the risk associated with the virus when more information is available.”

In the past:

  • Humans can be infected with avian and other zoonotic influenza viruses, such as avian influenza virus subtypes A(H5N1), A(H7N9), and A(H9N2)
  • Human infections are primarily acquired through direct contact with infected animals or contaminated environments
  • Avian infections in humans may cause disease ranging from mild conjunctivitis to severe pneumonia and even death.
  • The majority of human cases of A(H5N1) and A(H7N9) infection have been associated with direct or indirect contact with infected live or dead poultry. Controlling the disease in the animal source is critical to decrease risk to humans.

http://www.who.int/mediacentre/factsheets/avian_influenza/en/ 

http://www.who.int/influenza/human_animal_interface/avian_influenza/riskassessment_AH5N8_201611/en/

Why are people so concerned if the disease infects domesticated birds?

  • the potential for low pathogenic viruses to evolve into highly pathogenic viruses (we do know that this virus, is in fact, highly pathogenic)
  • the potential for rapid spread and significant illness and death among poultry during outbreaks of highly pathogenic avian influenza
  • the economic impact and trade restrictions from a highly pathogenic avian influenza outbreak
  • the possibility that avian influenza A viruses could be transmitted to humans

http://www.who.int/influenza/human_animal_interface/avian_influenza/riskassessment_AH5N8_201611/en/

Sol

Pre Lambing Checks – Heptavac P Plus vs. Ovivac P Plus

Hello Readers,

So i thought I’d start off with a few older photos. These photos where taking during lambing at the beginning of this year (2016). I was helping out with herding and loading the ewes to be brought back to the farm, ready to be checked and in for lambing. I was taught how to inject the ewes subcutaneously (I did about 100 in one day).

This injection was ‘Heptavac P Plus’. After some research into this injection tonight I came across a forum discussing the difference between ‘Heptavac P Plus’ and ‘Ovivac P Plus’. I started to look into the difference between the two and how they can prevent pasteurella pneumonia (organism in tonsils – disease released when animal is stressed) and clostridial disease (organisms for this found in soil).

The Heptavac P Plus contains antigens from seven clostridial species. This provides immunity to the lambs via colostrum during lambing. This vaccination is given during pre lambing checks as it must be injected with enough time to make its way into the milk. I also found that this injection is the most expensive of the two.

The Ovivac P Plus doesn’t contain the antigens from as many clostridial species (only 4). It is usually used for store lambs as they need the extra immunity they are not receiving from a ewe’s milk. This boost of immunity increases chance of survival, especially in the winter months when there is a peak in number of cases of these diseases.

I rang the farmer I did this with back in January/ February time, who I have worked with throughout the year. He told me he sold some store lambs a few years ago and knew that the customer injected the lambs with Ovivac P Plus as a little bit of extra immunity as it moved onto a new farm. The Ovivac is cheaper so more economical to use, if just a precaution.

If any lambs from lambing/ store lambs are kept for replacement they are boosted with the Ovivac P Plus at the time of pre tupping. After this they join the regular routine of the older ewes, receiving the Heptavac P Plus pre lambing.

This particular farmer chooses to use the Heptavac P Plus on all 500-600 ewes as the ewes are in constant contact with each other in sheds during lambing so does not want these diseases spreading through and killing his flock as it is the biggest killer of sheep – despite the large cost.

I wonder if any readers would like to share their experience with the two; what routine do you use? Is the Heptavac P Plus worth the extra money? Does anyone give Ovivac P Plus to ewes as they are in a low risk zone perhaps? I would love to hear your thoughts.

injectionphotoinjectionphoto2

The Forum can be found at :

https://thefarmingforum.co.uk/index.php?threads/ovivac-p-plus-or-heptavac-p-plus.11973/

References :

http://www.hodgesandmoss.co.uk/sheepvaccines.html

Sol

 

 

Welcome

Hello all,

After attending a Vetmed Link course this weekend I became very interested in sharing my journey through work experience, voluntary work and reading up on current affairs in the veterinary profession. I will write about my findings on work experience; not only what I practically learned but I also hope to comment on any ethical implications I came across – any photos will be placed here as well. I will also try to discuss topics that are in the news, in the veterinary world.

 

Sol