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DETECTION OF Enterocytozoon hepatopenaei (EHP) (MICROSPORIDIA) IN SEVERAL SPECIES OF POTENTIAL MACROFAUNA-CARRIERS FROM SHRIMP (Penaeus vannamei) PONDS IN MALAYSIA.

Infection by the microsporidian parasite Enterocytozoon hepatopenaei (EHP) has become a significant problem in the shrimp cultivation industry in Asian countries like Thailand, China, India, Vietnam, Indonesia, and Malaysia. The outbreak of this microsporidian parasite is predominantly related to the existence of macrofauna-carriers of EHP. However, information about potential macrofauna-carriers of EHP in rearing ponds is still limited. In this study, the screening of EHP in potential macrofauna-carriers was conducted in farming ponds of Penaeus vannamei in three states in Malaysia, namely Penang, Kedah, and Johor. A total of 82 macrofauna specimens (phyla: Arthropoda, Mollusca, and Chordata) were amplified through a polymerase chain reaction (PCR) assay targeting genes encoding spore wall proteins (SWP) of EHP. The PCR results showed a high prevalence of EHP (82.93%). The phylogenetic tree generated from the macrofauna sequences was revealed to be identical to the EHP-infected shrimp specimens from Malaysia (MW000458, MW000459, and MW000460), as well as those from India (KY674537), Thailand (MG015710), Vietnam (KY593132), and Indonesia (KY593133). These findings suggest that certain macrofauna species in shrimp ponds of P. vannamei are carriers of EHP spores and could be potential transmission vectors. This study provides preliminary information for the prevention of EHP infections that can be initiated at the pond stage by eradicating macrofauna species identified as potential vectors.

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