Volume 18, Number 9—September 2012
Research
Prevention and Control of Fish-borne Zoonotic Trematodes in Fish Nurseries, Vietnam
, 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
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.