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Is MS the next ‘big, bad Mycoplasma’ for US poultry?

The US poultry industry is reporting more problems with virulent Mycoplasma synoviae (MS), Naola Ferguson, DVM, associate professor at the University of Georgia, told Poultry Health Today.

MS causes upper-respiratory disease, leg problems, liver problems, pneumonia and eggshell-quality issues. It can spread faster, is more persistent and is more difficult to manage than Mycoplasma gallisepticum (MG), which has been considered the “big, bad Mycoplasma” of poultry, she said.

In adult breeders, MS problems typically start at the peak of egg laying. Broilers are infected vertically, with clinical signs in the flock appearing at about 3 weeks of age, Ferguson said.

Problems with MS are more likely to occur on multiple-age broiler farms. The severity of the disease tends to be worse when it’s cold because of the synergistic effect with respiratory viruses and poor air quality, which can lead to severe airsacculitis and clinical signs, Ferguson said.

The key to keeping ahead of MS is to make use of the sensitive diagnostic tests available — ELISA and PCR (polymerase chain reaction testing). Sometimes companies try to save money by forgoing diagnostics, but without diagnostic information from earlier stages of the flock, it’s difficult to tell when the birds got infected and how to prevent the problem from happening in the future, she said.

For MG control, vaccines and antibiotics are the only options available. Breeders are vaccinated to prevent vertical transmission from hens to broilers. But vaccines aren’t available for MS in the US, so antibiotics are the only option, Ferguson continued.

Antibiotic water treatment controls MS immediately. Producers can give a high dose in a short period of time to try and knock down the levels as soon as MS is diagnosed.

In-feed antibiotics are for long-term MS prevention, for trying to keep the infection level down over time and to help prevent both vertical and horizontal transmission, she explained.

Posted on June 20, 2018

tags: ,
  • Good flock management key to managing Mycoplasma synoviae resurgence

    Broiler producers need to take a fresh look at housing conditions and bird management to help counter the resurgence of Mycoplasma synoviae linked to an increase in raised without antibiotics (RWA) production.

  • Poultry litter management key to MS control

    Litter topped the list of environmental factors most consistently positive for Mycoplasma synoviae (MS), Naola Ferguson, DVM, associate professor at the University of Georgia, told Poultry Health Today.

  • Mycoplasma synoviae demanding more attention as poultry industry grasps its full impact

    Emerging, variant strains of Mycoplasma synoviae are causing eggshell apex abnormalities as well as production drops in both layer and breeding flocks worldwide, Anneke Feberwee, DVM, PhD, from GD Animal Health, the Netherlands, told Poultry Health Today.

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Genotypes of infectious bronchitis virus (IBV) found in California between 2012 and 2020 have seen a “major shift,” according to a study investigating patterns of IBV in the state.

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