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Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Larva of greater wax moth Galleria mellonella is a suitable alternative host for the fish pathogen Francisella noatunensis subsp. orientalis
Author(s): Djainal, Winarti Achmad Sarmin
Shahin, Khalid
Metselaar, Matthijs
Adams, Alexandra
Desbois, Andrew P
Keywords: Alternative model
Piscine francisellosis
Oreochromis niloticus
Red Nile tilapia
Issue Date: 2020
Citation: Djainal WAS, Shahin K, Metselaar M, Adams A & Desbois AP (2020) Larva of greater wax moth Galleria mellonella is a suitable alternative host for the fish pathogen Francisella noatunensis subsp. orientalis. BMC Microbiology, 20, Art. No.: 8.
Abstract: Background Francisella noatunensis subsp. orientalis (Fno) is the etiological agent of francisellosis in cultured warm water fish, such as tilapia. Antibiotics are administered to treat the disease but a better understanding of Fno infection biology will inform improved treatment and prevention measures. However, studies with native hosts are costly and considerable benefits would derive from access to a practical alternative host. Here, larvae of Galleria mellonella were assessed for suitability to study Fno virulence. Results Larvae were killed by Fno in a dose-dependent manner but the insects could be rescued from lethal doses of bacteria by antibiotic therapy. Infection progression was assessed by histopathology (haematoxylin and eosin staining, Gram Twort and immunohistochemistry) and enumeration of bacteria recovered from the larval haemolymph on selective agar. Fno was phagocytosed and could survive intracellularly, which is consistent with observations in fish. Virulence of five Fno isolates showed strong agreement between G. mellonella and red Nile tilapia hosts. Conclusions This study shows that an alternative host, G. mellonella, can be applied to understand Fno infections, which will assist efforts to identify solutions to piscine francisellosis thus securing the livelihoods of tilapia farmers worldwide and ensuring the production of this important food source.
DOI Link: 10.1186/s12866-020-1695-0
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