Test profiles of broiler breeder flocks housed in farms with endemic Mycoplasma synoviae infection

Abstract

There is a need for a better understanding of the epidemiology of Mycoplasma synoviae (MS) infection in broiler breeders in Brazil. Many features of the infection remain unrecognizable, because there are no clinical signs of the disease. A detailed testing was performed at each 6 to 8 weeks in three MS-free flocks introduced in farms with endemic MS infection for a follow-up epidemiological study. Every flock was monitored by polymerase chain reaction (PCR), by serum plate agglutination (SPA) and hemagglutination inhibition (HI) for serology studies, and isolation of mycoplasmas from tracheal swabs. PCR was found to be the most sensitive test, detecting early MS infection. Serology was positive in less than 50% of the sera and MS was isolated only between 27 and 28 weeks of age and in a maximum of 60% positive hens. A similar profile was seen for MS infection in all three flocks. Infection started at brooding, whereas laboratory detection of the assymptomatic infection was more probable in the weeks of increasing egg production. This predictable profile during rearing may be very useful for the optimization of monitoring MS infection in broiler breeder flocks.

Swine and Poultry Pathogens: the Complete Genome Sequences of Two Strains ofMycoplasma hyopneumoniaeand a Strain ofMycoplasma synoviae

“…Specificpathogen-free pigs inoculated with strain 7448 consistently produced the characteristic symptoms of enzootic pneumonia. M. synoviae was isolated from a broiler breeder in the state of Paraná in Brazil (19).…”

Mycoplasma gallisepticum: an emerging challenge to the poultry industry in Egypt

“…and sera from chickens infected with infectious bursal disease viruses were found to cross-react in M. gallisepticum SPA tests(30). In addition, different degrees of temporary immunosuppression might have allowed a more significant invasion of M. gallisepticum, and a consequent positive serological response a posteriori(10). However, it is often difficult to isolate M. gallisepticum in cultures from flocks that are concurrently infected with one or more nonpathogenic Mycoplasma species, such as: M. gallinarum, M. gallinaceum, M. pullorum, M. gallopavonis or Acholeolasma laidlawii.…”

Development and evaluation of a multi-locus sequence typing scheme for Mycoplasma synoviae

“…The complete genome sequence of M. synoviae strain MS53 (acc.no. NC_007294.1) isolated in Brazil was also included in the DNA analysis (Fiorentin et al, 2003;Vasconcelos et al, 2005). Most samples originated from different categories of poultry (broiler and layer reproduction stock, commercial layers, meat turkeys and turkey reproduction stock) and were collected between and including the years 1955 and 2014.…”