High occurrence of Mycoplasma suis infection in swine herds from non-technified farms in Mossoró, state of Rio Grande do Norte, Northeastern Brazil.

Mycoplasma suis, the etiological agent of swine hemoplasmosis, has been neglected in swine herds around the world. Swine hemoplasmosis is frequently associated with hemolytic anemia, disgalacty, infertility and immunosuppression, and it results in significant economic losses. This study investigates the occurrence of M. suis in non-technified swine herds in the northeastern region of Brazil using quantitative PCR (qPCR) based on the 16S rRNA gene. Between March and August 2013, blood samples from 147 swine were collected during slaughter in the city of Mossoró, state of Rio Grande do Norte, northeastern Brazil. One hundred and twelve samples (76.19%) were positive for M. suis by qPCR assays. The range of Cqs and quantification (copies of a M. suis-16S rRNA gene fragment/µL) was 20.86-37.89 and 1.64×101-6.64×107, respectively. One can conclude that M. suis infection have high occurrence (76,19%) in non-technified swine-rearing systems in Mossoró in the state of Rio Grande do Norte, Brazil.

High occurrence of Mycoplasma suis infection in swine herds from non-technified farms in Mossoró, state of Rio Grande do Norte, Northeastern Brazil / Alta ocorrência de infecção por Mycoplasma suis em suínos de criações não tecnificadas de Mossoró, estado do Rio Grande do Norte, Nordeste brasileiro

Abstract Mycoplasma suis, the etiological agent of swine hemoplasmosis, has been neglected in swine herds around the world. Swine hemoplasmosis is frequently associated with hemolytic anemia, disgalacty, infertility and immunosuppression, and it results in significant economic losses. This study investigates the occurrence of M. suis in non-technified swine herds in the northeastern region of Brazil using quantitative PCR (qPCR) based on the 16S rRNA gene. Between March and August 2013, blood samples from 147 swine were collected during slaughter in the city of Mossoró, state of Rio Grande do Norte, northeastern Brazil. One hundred and twelve samples (76.19%) were positive for M. suis by qPCR assays. The range of Cqs and quantification (copies of a M. suis-16S rRNA gene fragment/µL) was 20.86–37.89 and 1.64×101–6.64×107, respectively. One can conclude that M. suis infection have high occurrence (76,19%) in non-technified swine-rearing systems in Mossoró in the state of Rio Grande do Norte, Brazil.

Resumo Mycoplasma suis, agente etiológico da hemoplasmose suína, tem sido negligenciado nas criações de suínos ao redor do mundo. A hemoplasmose suína é frequentemente associada à anemia hemolítica, disgalactia, infertilidade e imunossupressão, acarretando em perdas econômicas. O objetivo do presente trabalho foi investigar, por meio da PCR quantitativa (qPCR) baseada no gene rRNA 16S, a ocorrência de M. suis em amostras de sangue de suínos de criações não tecnificadas na cidade de Mossoró, Estado do Rio Grande do Norte. Entre março a agosto de 2013, foram colhidas amostras de sangue de 147 suínos de criações não tecnificadas da referida região. Cento e doze amostras (76,19%) amostras mostraram-se positivas na qPCR para M. suis. A média dos Cqs e da quantificação (número de cópias do gene 16S rRNA de M. suis por microlitro) foi de 20,86 – 37,89 e 1,64 x 101 a 6,64 x 107, respectivamente. Conclui-se que a infecção por M. suis apresenta alta ocorrência (76,19%) em criações de suínos não tecnificadas na cidade de Mossoró, estado do Rio Grande do Norte.