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Invasive snails and an emerging infectious disease: results from the first national survey on Angiostrongylus cantonensis in China.
PLoS Negl Trop Dis. 2009; 3(2):e368.PN

Abstract

BACKGROUND

Eosinophilic meningitis (angiostrongyliasis) caused by Angiostrongylus cantonensis is emerging in mainland China. However, the distribution of A. cantonensis and its intermediate host snails, and the role of two invasive snail species in the emergence of angiostrongyliasis, are not well understood.

METHODOLOGY/PRINCIPAL FINDINGS

A national survey pertaining to A. cantonensis was carried out using a grid sampling approach (spatial resolution: 40x40 km). One village per grid cell was randomly selected from a 5% random sample of grid cells located in areas where the presence of the intermediate host snail Pomacea canaliculata had been predicted based on a degree-day model. Potential intermediate hosts of A. cantonensis were collected in the field, restaurants, markets and snail farms, and examined for infection. The infection prevalence among intermediate host snails was estimated, and the prevalence of A. cantonensis within P. canaliculata was displayed on a map, and predicted for non-sampled locations. It was confirmed that P. canaliculata and Achatina fulica were the predominant intermediate hosts of A. cantonensis in China, and these snails were found to be well established in 11 and six provinces, respectively. Infected snails of either species were found in seven provinces, closely matching the endemic area of A. cantonensis. Infected snails were also found in markets and restaurants. Two clusters of A. cantonensis-infected P. canaliculata were predicted in Fujian and Guangxi provinces.

CONCLUSIONS/SIGNIFICANCE

The first national survey in China revealed a wide distribution of A. cantonensis and two invasive snail species, indicating that a considerable number of people are at risk of angiostrongyliasis. Health education, rigorous food inspection and surveillance are all needed to prevent recurrent angiostrongyliasis outbreaks.

Authors+Show Affiliations

National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, People's Republic of China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19190771

Citation

Lv, Shan, et al. "Invasive Snails and an Emerging Infectious Disease: Results From the First National Survey On Angiostrongylus Cantonensis in China." PLoS Neglected Tropical Diseases, vol. 3, no. 2, 2009, pp. e368.
Lv S, Zhang Y, Liu HX, et al. Invasive snails and an emerging infectious disease: results from the first national survey on Angiostrongylus cantonensis in China. PLoS Negl Trop Dis. 2009;3(2):e368.
Lv, S., Zhang, Y., Liu, H. X., Hu, L., Yang, K., Steinmann, P., Chen, Z., Wang, L. Y., Utzinger, J., & Zhou, X. N. (2009). Invasive snails and an emerging infectious disease: results from the first national survey on Angiostrongylus cantonensis in China. PLoS Neglected Tropical Diseases, 3(2), e368. https://doi.org/10.1371/journal.pntd.0000368
Lv S, et al. Invasive Snails and an Emerging Infectious Disease: Results From the First National Survey On Angiostrongylus Cantonensis in China. PLoS Negl Trop Dis. 2009;3(2):e368. PubMed PMID: 19190771.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Invasive snails and an emerging infectious disease: results from the first national survey on Angiostrongylus cantonensis in China. AU - Lv,Shan, AU - Zhang,Yi, AU - Liu,He-Xiang, AU - Hu,Ling, AU - Yang,Kun, AU - Steinmann,Peter, AU - Chen,Zhao, AU - Wang,Li-Ying, AU - Utzinger,Jürg, AU - Zhou,Xiao-Nong, Y1 - 2009/02/03/ PY - 2008/09/23/received PY - 2008/12/22/accepted PY - 2009/2/5/entrez PY - 2009/2/5/pubmed PY - 2010/3/12/medline SP - e368 EP - e368 JF - PLoS neglected tropical diseases JO - PLoS Negl Trop Dis VL - 3 IS - 2 N2 - BACKGROUND: Eosinophilic meningitis (angiostrongyliasis) caused by Angiostrongylus cantonensis is emerging in mainland China. However, the distribution of A. cantonensis and its intermediate host snails, and the role of two invasive snail species in the emergence of angiostrongyliasis, are not well understood. METHODOLOGY/PRINCIPAL FINDINGS: A national survey pertaining to A. cantonensis was carried out using a grid sampling approach (spatial resolution: 40x40 km). One village per grid cell was randomly selected from a 5% random sample of grid cells located in areas where the presence of the intermediate host snail Pomacea canaliculata had been predicted based on a degree-day model. Potential intermediate hosts of A. cantonensis were collected in the field, restaurants, markets and snail farms, and examined for infection. The infection prevalence among intermediate host snails was estimated, and the prevalence of A. cantonensis within P. canaliculata was displayed on a map, and predicted for non-sampled locations. It was confirmed that P. canaliculata and Achatina fulica were the predominant intermediate hosts of A. cantonensis in China, and these snails were found to be well established in 11 and six provinces, respectively. Infected snails of either species were found in seven provinces, closely matching the endemic area of A. cantonensis. Infected snails were also found in markets and restaurants. Two clusters of A. cantonensis-infected P. canaliculata were predicted in Fujian and Guangxi provinces. CONCLUSIONS/SIGNIFICANCE: The first national survey in China revealed a wide distribution of A. cantonensis and two invasive snail species, indicating that a considerable number of people are at risk of angiostrongyliasis. Health education, rigorous food inspection and surveillance are all needed to prevent recurrent angiostrongyliasis outbreaks. SN - 1935-2735 UR - https://www.unboundmedicine.com/medline/citation/19190771/Invasive_snails_and_an_emerging_infectious_disease:_results_from_the_first_national_survey_on_Angiostrongylus_cantonensis_in_China_ L2 - https://dx.plos.org/10.1371/journal.pntd.0000368 DB - PRIME DP - Unbound Medicine ER -