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First Report of Perkinsus olseni-Induced Mass Mortality in Manila Clams (Ruditapes philippinarum) in China
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Perkinsus olseni infections in Chinese mollusks have historically shown high prevalence but low intensity with no associated mortality. In August 2025, mass mortality (~50%) occurred in cultured Manila clams (Ruditapes philippinarum) in Nantong, China. Affected clams exhibited significantly higher infection intensity (mean >2.0 vs. 1.0; P < 0.01) and lower condition index (P < 0.0001) than healthy clams. Histopathology confirmed trophozoite aggregation in vital tissues. ITS sequencing identified P. olseni as the causative agent. Bacterial loads were significantly lower in affected clams, ruling out bacterial pathogens as the primary cause. This first report of Perkinsus-induced mortality in China challenges the benign parasite paradigm.
Title: First Report of Perkinsus olseni-Induced Mass Mortality in Manila Clams (Ruditapes philippinarum) in China
Description:
Perkinsus olseni infections in Chinese mollusks have historically shown high prevalence but low intensity with no associated mortality.
In August 2025, mass mortality (~50%) occurred in cultured Manila clams (Ruditapes philippinarum) in Nantong, China.
Affected clams exhibited significantly higher infection intensity (mean >2.
0 vs.
1.
0; P < 0.
01) and lower condition index (P < 0.
0001) than healthy clams.
Histopathology confirmed trophozoite aggregation in vital tissues.
ITS sequencing identified P.
olseni as the causative agent.
Bacterial loads were significantly lower in affected clams, ruling out bacterial pathogens as the primary cause.
This first report of Perkinsus-induced mortality in China challenges the benign parasite paradigm.
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