Egg Industry - October 2019 - 4

4 ❙ EggIndustry

How layer
vaccination
can effectively
control
Salmonella
Vaccination programs using
live vaccines and inactivated
bacterins have become important
components of the egg industry's
Salmonella control programs.
JERRY DREYER

E

gg producers have invested heavily in the past to
reduce the incidences of Salmonella enteritidis (SE) in table eggs with refrigeration,
improved cleaning and disinfection of facilities,
enhanced biosecurity, better pest control, testing and
record-keeping. An additional option that has widely
been included in SE control programs has been the use
of live Salmonella vaccines and inactivated bacterins.
"The low incidence of reported Salmonella enteritidis outbreaks from eggs in recent years is a testament
of the success of the egg industry's efforts to control
this organism," said Dr. Jim Sandstrom, managing
director, Epitopix.
Dr. Kalen Cookson, director of clinical research
at Zoetis, explained the rationale of using a combined
live and inactivated vaccination program. 
"As we can't administer inactivated bacterins early
in life, live vaccine has value to establish an early
onset of local secretory antibodies (immunoglobulin
A, or IgA) and cellular immunity in the intestine," he

said. "We feel competitive exclusion as well as local
immunity helps prevent the establishment of wild
type Salmonella in the gut. There is also a potential
of cross-protection against strains of other serogroups,
which is also important. A second live (booster)
vaccination increases both the level and duration of
immunity." 
"Inactivated bacterins induce long-persisting
systemic (immunoglobulin G, or IgG) antibodies,
which circulate in the bloodstream. These systemic
IgG antibodies provide a wall of defense by creating a
barrier against invasive Salmonella from spreading to
the reproductive tract," Cookson said.  
Studies have shown the combination of live and
inactivated Salmonella products provide the widest
range of cross-protection over the duration of a layer's
production period. Scientists generally agree that
conventional inactivated Salmonella products stimulate
long-term specific immunity. 
Greg Rennier, president of Rennier Associates,
www.WATTAgNet.com ❙ October 2019


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Egg Industry - October 2019

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

Egg Industry - October 2019
How layer vaccination can effectively control Salmonella
Rose Acre facility redesign emphasizes food safety
Positioning hard-boiled eggs in the snacking market
Egg Industry - October 2019 - CT1
Egg Industry - October 2019 - CT2
Egg Industry - October 2019 - Egg Industry - October 2019
Egg Industry - October 2019 - Cover2
Egg Industry - October 2019 - CT3
Egg Industry - October 2019 - CT4
Egg Industry - October 2019 - 3
Egg Industry - October 2019 - How layer vaccination can effectively control Salmonella
Egg Industry - October 2019 - 5
Egg Industry - October 2019 - 6
Egg Industry - October 2019 - 7
Egg Industry - October 2019 - 8
Egg Industry - October 2019 - 9
Egg Industry - October 2019 - Rose Acre facility redesign emphasizes food safety
Egg Industry - October 2019 - 11
Egg Industry - October 2019 - 12
Egg Industry - October 2019 - 13
Egg Industry - October 2019 - 14
Egg Industry - October 2019 - 15
Egg Industry - October 2019 - 16
Egg Industry - October 2019 - 17
Egg Industry - October 2019 - 18
Egg Industry - October 2019 - 19
Egg Industry - October 2019 - Positioning hard-boiled eggs in the snacking market
Egg Industry - October 2019 - 21
Egg Industry - October 2019 - 22
Egg Industry - October 2019 - Cover3
Egg Industry - October 2019 - Cover4
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