ABSTRACT
The occurrence of Setaria digitata in a horse is reported for the first time in Malaysia. An 8-year-old Thoroughbred cross mare was referred to the University Veterinary Clinic with the primary complaint of corneal opacity and excessive eye discharge. After initial treatment with Terramycin eye ointment, corneal opacity cleared partially to reveal a moving thread-like cylindrical worm in the anterior chamber of the eye. The parasite was successfully removed surgically, and examination under the light microscope revealed that the isolated worm (lengthâ¯=â¯45â¯mm) was a 5th stage larva of S. digitata based on morphological criteria. Confirmation of the species of the worm was through molecular methods. The 12S rRNA gene was PCR-amplified, and the purified amplicon was directly sequenced. Phylogenetic analyses revealed that the isolated roundworm showed 100% sequence similarity with that of S. digitata in NCBI GenBank database (Accession no.: KY284626.1). This report is the first confirmed case of equine ocular setariasis by S. digitata in Malaysia. The current study provides evidence that S. digitata is an etiological agent of ocular infection and its presence in Malaysia.
Subject(s)
Eye Infections, Parasitic/veterinary , Horse Diseases/parasitology , Setaria Nematode/isolation & purification , Setariasis/diagnosis , Animals , Anterior Chamber/parasitology , Anterior Chamber/surgery , Anti-Bacterial Agents/therapeutic use , Base Sequence , DNA, Helminth/chemistry , DNA, Helminth/isolation & purification , Eye Infections, Parasitic/diagnosis , Eye Infections, Parasitic/parasitology , Eye Infections, Parasitic/surgery , Female , Horse Diseases/diagnosis , Horse Diseases/drug therapy , Horses , Larva/anatomy & histology , Larva/classification , Malaysia , Ointments , Oxytetracycline/therapeutic use , Phylogeny , Polymerase Chain Reaction/veterinary , RNA, Ribosomal/genetics , Setaria Nematode/anatomy & histology , Setaria Nematode/classification , Setaria Nematode/genetics , Setariasis/parasitology , Setariasis/surgeryABSTRACT
A virus, named Oya virus, was isolated in Vero cell cultures from the lungs of a pig suspected of Nipah virus infection. The virus was revealed as a spherical enveloped RNA virus with a diameter of 79 nm. For identification of Oya virus, RT-PCR was performed. A common primer set for S-RNA of the Simbu serogroup of the genus Bunyavirus was able to amplify a cDNA from Oya virus RNA. The sequence data of the product revealed that the partial gene of Oya virus S-RNA segment had 65-70% homology with published cDNA sequences of Simbu serogroup viruses. The phylogenetic analysis of the data showed that the Oya virus is grouped in Simbu serogroup, but is genetically distinct from the serogroup viruses that have been analyzed molecularly. Serological surveys revealed that the virus distributed widely and densely in Malaysia.
