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Volume 18, Number 9—September 2012

Research

Prevention and Control of Fish-borne Zoonotic Trematodes in Fish Nurseries, Vietnam

Jesper Hedegaard ClausenComments to Author , Henry Madsen, K. Darwin Murrell, Phan Thi Van, Ha Nguyen Thi Thu, Dung Trung Do, Lan Anh Nguyen Thi, Hung Nguyen Manh, and Anders Dalsgaard
Author affiliations: University of Copenhagen, Copenhagen, Denmark (J.H. Clausen, H. Madsen, K.D. Murrell, A. Dalsgaard); Research Institute for Aquaculture No.1, Bac Ninh, Vietnam (P.T. Van, H.N.T. Thu); National Institute of Malariology, Parasitology, and Entomology, Hanoi, Vietnam (D.T. Do); National Institute of Veterinary Research, Hanoi (L.A.N. Thi); and Vietnam Academy of Science and Technology, Hanoi (H.N. Manh)

Main Article

Table

Prevalence and intensity of FZT infections, Vietnam*

Year and animal tested Egg prevalence in nurseries†
No. eggs/g
Maximum no. eggs/g
Mean potential egg contamination index‡
Intervention§
Intervention§
Intervention§
Intervention§
None Before End None Before End None Before End None Before End
2009

Man

71 (14.1) 169 (14.8) 188 (3.2) 233.4 55.8 15.9 7,026.4 2,434.1 2,290.2 165,707 40,799 2,174

Cat

6 (50.0) 14 (50.0) 13 (15.4) 3.5 34.6 0.2 9.4 461.5 2.0 70 786 3

Dog

13 (30.8) 48 (18.8) 45 (15.6) 2.3 0.1 1 25.3 2.4 16.3 213 34 252

Pig

85 (1.2) 259 (0.8) 290 (0.3) 0 0 0 0.8 1.8 1.2 101 0 130
2010¶

Man

32 (12.5) 70 (1.4) 66 (0) 24.7 0.2 0 431.7 12.0 0 25,324 0 0

Cat

0 7 (57.1) 2 (0) 0 12.9 0 0 60.0 0 0 80 0

Dog

2 (0) 17 (11.8) 15 (6.7) 0 3.8 0.1 0 49.0 1.0 0 1.073 0

*FZT, fish-borne zoonotic trematode; man, human (male or female); before, before intervention; end, end of production cycle.
†No. hosts examined (% egg prevalence)
‡Number of eggs excreted by total numbers of final hosts (humans, cats, dogs, and pigs) to pond or pond surroundings.
§FZT egg examinations at nonintervention farms were performed only at the end of the production cycle. The FZT infection status at nonintervention nurseries at the end of the production cycle is comparable with the infection status at intervention nurseries before the intervention was implemented. ¶Because of low FZT prevalence among pigs, pig data were not included in 2010 analyses.

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