Egg Industry - June 2019 - 16

16 ❙ EggIndustry
VACCINE OPTIONS
been requested by producers for formulation of autogenous
products. These include infectious bronchitis variants that
cause false layer syndrome, mycoplasma, emerging E. coli
serotypes and Ornithobacterium rhinotracheale (ORT).
Veterinarians assisting producers may recommend
autogenous products with multiple pathogens. Kelli Jones,
technical services manager at Ceva, says: "In complicated
situations, we are often able to isolate various disease
organisms. So we recommend a multivalent autogenous
product as we can't determine how much each individual
organism is contributing to production losses. It's not
uncommon for these diseases to be less dramatic on their
own, but when presented as a secondary pathogen, the
clinical picture changes quickly." 
Jones reports that customers have requested autogenous
products with E. coli, Gallibacterium anatis, ORT, and
infectious coryza, as all were isolated on the same farm.
The aforementioned Gallibacterium anatis is
mentioned more frequently as being responsible for

Infectious coryza clinical signs include sinusitis and
nasal exudate. Sherrill Davison
moderate production losses and increased mortality. 
Autogenous bacterins are helping reduce lesions in
ovaries, liver and oviducts, which can also result in egg
shell quality issues.
Less common Salmonella serotypes are also requested
by producers in autogenous products as one tool to help
reduce and control infection on a facility. These products
are used with other interventions as vaccination alone will
not achieve the desired impact.
Duck atadenovirus A, which produces a disease
called egg drop syndrome '76, has been confirmed in
Pennsylvania and has producers requesting autogenous
vaccines. This virus is endemic in other parts of the world
and can be transmitted by waterfowl. Vaccination will
help prevent egg production drops of 10% to 40%, but
birds become infected and continue to shed virus at lower
levels than unvaccinated birds.

Reappearing diseases

Primary shell gland infection with G. anatis results
in wrinkled eggshells. Kelli Jones

As pastured flocks increase, older soil-borne diseases
are reappearing, which may require autogenous products. Erysipelas is a bacterial disease that can cause costly
mortality. Most commercial products are labeled for swine
and turkey use.
Fowl cholera is another bacterial disease capable
of causing losses due to mortality and production
drops. There are live and inactivated commercial products
that provide varying levels of protection against serotypes
not included in the products.  
www.WATTAgNet.com ❙ June 2019


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Egg Industry - June 2019

Table of Contents for the Digital Edition of Egg Industry - June 2019

Egg Industry - June 2019
To meet cage-free pledges, industry will need to grow 3 times faster
Vaccine options that can improve fl ock health
Probiotic tools may help fl ock health challenges
Egg Industry - June 2019 - CT1
Egg Industry - June 2019 - CT2
Egg Industry - June 2019 - Egg Industry - June 2019
Egg Industry - June 2019 - Cover2
Egg Industry - June 2019 - CT3
Egg Industry - June 2019 - CT4
Egg Industry - June 2019 - 3
Egg Industry - June 2019 - 4
Egg Industry - June 2019 - 5
Egg Industry - June 2019 - To meet cage-free pledges, industry will need to grow 3 times faster
Egg Industry - June 2019 - 7
Egg Industry - June 2019 - 8
Egg Industry - June 2019 - 9
Egg Industry - June 2019 - 10
Egg Industry - June 2019 - 11
Egg Industry - June 2019 - 12
Egg Industry - June 2019 - 13
Egg Industry - June 2019 - Vaccine options that can improve fl ock health
Egg Industry - June 2019 - 15
Egg Industry - June 2019 - 16
Egg Industry - June 2019 - 17
Egg Industry - June 2019 - 18
Egg Industry - June 2019 - Probiotic tools may help fl ock health challenges
Egg Industry - June 2019 - 20
Egg Industry - June 2019 - 21
Egg Industry - June 2019 - 22
Egg Industry - June 2019 - Cover3
Egg Industry - June 2019 - Cover4
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