Abstract
Ovine progressive pneumonia (OPP) is the most severe presentation of small ruminant lentivirus (SRLV) infection known as Maedi-Visna. Serological evidence in Mexico of the presence of this lentivirus was published in 1986. After that, studies revealed that SRLVs have a broad distribution in Mexico by detecting antibodies or/and molecular tests; however, a descriptive case of the disease has not been published. This work's objective was to describe the diagnosis of a case of OPP through lesion description, serology, and molecular test. The histopathological study showed that lymph follicular hyperplasia, interstitial pneumonia, and smooth muscle hyperplasia were presented. The serological test demonstrated specific antibodies against the Maedi-Visna virus, and PCR analysis demonstrated a positive outcome. These results include the criteria for the diagnosis of OPP. The serological prevalence of this disease is presented, contributing to the knowledge of the ecology of this disease in the world. This work is the first case report of ovine progressive pneumonia in Mexico and evidence of seroprevalence in sheep herds from Sonora, Mexico.
Highlights
Maedi-Visna virus (MVV) and caprine arthritis encephalitis virus (CAEV) are members of the group of small ruminant lentiviruses (SRLVs) classified in the OIE-World Organization for Animal Health list of notifiable animal diseases
Some studies through the detection of antibodies or molecular tests revealed that SRLVs have a wide distribution in small ruminant herds in Mexico [10, 11]; a descriptive case of this disease has not been published in Mexico
The results showed that a true prevalence of Ovine progressive pneumonia (OPP) was 3.7%, and 26.6% of flocks had at least one seropositive animal
Summary
Maedi-Visna virus (MVV) and caprine arthritis encephalitis virus (CAEV) are members of the group of small ruminant lentiviruses (SRLVs) classified in the OIE-World Organization for Animal Health list of notifiable animal diseases. These diseases result in progressive and persistent infections that affect animal health and international trade. As a consequence that OPP is a slowly progressive disease, only a small proportion of infected sheep develop pathognomonic lesions; the detection of specific antibodies against the MVV in the serum samples and conclusive diagnosis using molecular techniques are the most valuable methods for the detection of OPP in the herds [6, 8]. Evidence of the prevalence of this disease in this geographic region is presented
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