INFLUENCE OF SALMONELLA INFECTION IN CHICKENS ON THE OUTCOME OF CAMPYLOBACTERIOSIS IN EXPERIMENTAL CONDITIONS
2011
Meat, table eggs and their products are very important in human nutrition.
Therefore, it is necessary to monitor the health status of commercial flocks
as much as the quality of poultry products in the food chain. Campylobacter
sp. and Salmonella sp. are widely distributed in nature. The influence of
these bacteria on animal health depends on the immune response. If animals
are not immunologicaly compromised, the infection is latent and clinical
symptoms are absent. Unlike animals, these bacteria cause serious diseases in
humans and the morbidity is quite high. The main transfer of infection to
humans is via poultry products. The goal of this work was to study the role
of Salmonella in artificially infected chickens onto the outcome of clinical
campylobacteriosis. It is certain that salmonella infection in poultry
damages the immune system of chickens, enabling Campylobacter to multiply and
subsequently induce a disease. Three groups of chickens were included in the
experiment. The first group received a suspension of field strain of
Campylobacter jejuni (C. jejuni) and Salmonella enterica serovar Enteritidis
(S. Enteritidis). The second group received an inoculum prepared from the
field isolate of Campylobacter jejuni and the third group received the field
isolate of Salmonella enterica serotype Enteritidis, only. In artificially
infected chickens Campylobacter and Salmonella were confirmed by isolation
and identification according to morphological, cultural and biochemical
properties. Humoral immune response of infected chickens was monitored using
the complement fixation test (CFT). In chickens infected with C. jejuni and
S. Enteritidis the clinical symptoms were recorded. The results from this
experiment show that salmonella infection damages the immune system of the
chickens enabling Campylobacter to alter the health status of the host.
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