In vitro culture of L3 larvae of nematodes obtained from the African giant snail Lissachatina fulica (Mollusca: Gastropoda) in Santa Fe de Antioquia
Abstract
Introduction: Over 170 municipalities in Colombia have been invaded by Lissachatina fulica, an African snail that can carry larvae of nematodes of interest in human and veterinary health. Nematodes enter the host snail as larvae L1 and then change to L2 and L3, the infectious form for vertebrates.
Objective: To standardize culture in vitro of L3 carried by L. fulica from Santa Fe de Antioquia.
Materials and methods: Between July and November, 2014, 10 snails were collected, killed, and conserved with HCl 0.7%. Larvae were recovered using the Baermann technique and cultured for 36 days in Schneider, DMEM and RPMI media, with and without SFB 20% and distilled water with SFB 20%. Replacements were made every 36 hours; larvae were measured with an ocular micrometer on a microscope. Summary statistics were estimated; box and whisker plots were made; the t Student test was performed in SPSS 18™. A p-value below 0.05 was assumed as significant.
Results: Fifty per cent of the larvae survived. The highest survival and growth was 85% in supplemented DMEM. The final average length of larvae in supplemented media exceeded the initial one. There were significant differences between the average length of larvae cultured in supplemented media and the initial length. The initial width of larvae did not change.
Conclusions: The best medium for the culture of L3 larvae was supplemented DMEM. The length provided more information than the width for the larval growth evaluation. The larvae studied did not correspond to Angiostrongylus cantonensis, A. costaricensis or Aelurostrongylus abstrusus.
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References
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