Antimicrobial-free control of fowl typhoid in laying hens - case report

Antimicrobial-free control of fowl typhoid in laying hens - case report

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ABSTRACT Salmonella Gallinarum (SG) is a Gram-negative bacterium telemarkskongen flue responsible for causing fowl typhoid (FT), a septicemic disease that results in significant losses in poultry farming.Although antimicrobials reduce clinical signs and mortality, they are not effective against the infection, as clinical signs may recur, and birds may continue to shed the pathogen after treatment.The irrational use of these drugs is one of the main factors related to the emergence of resistant strains, raising concerns for public and animal health.

This report describes the alternative control of FT in cage-free laying hens on a poultry farm in Minas Gerais, Brazil.Following a sudden increase in mortality, five birds were sent to the Avian Diseases Laboratory at the Federal University of Minas Gerais for examination.Bacterial isolation, biochemical tests, rapid serum agglutination and PCR were performed, confirming SG infection in two birds.

To control the outbreak, the live attenuated 9R vaccine was used in combination with the removal of sick birds, resulting in a reduction in mortality and clinical signs.It was concluded that, in the face swish supreme glide track white of an outbreak of FT, biosecurity measures combined with vaccination using the 9R strain and removal of sick birds are effective in disease control.