A specific DNA probe (pMG4) was used to diagnose M. gallisepticum (MG) infection in field outbreaks in chicken and turkey breeder flocks in Israel. Dot-blot hybridisation of tracheal swab suspensions with the probe enabled positive identification of MG as early as 4 days after sampling, even in flocks at an early stage of infection when no other specific indications of infection were available.
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