Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future
Abstract Background Cercarial dermatitis, colloquially “swimmer’s itch”, is a rash contracted in natural bodies of water, when people are exposed to skin-penetrating, larval flatworm parasites of the family Schistosomatidae, that emerge from aquatic snails. Swimmer’s itch is a globally-distributed,...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
BMC
2018-10-01
|
| Series: | Environmental Health |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s12940-018-0417-7 |
| _version_ | 1818672024905580544 |
|---|---|
| author | Michelle A Gordy Tyler P Cobb Patrick C Hanington |
| author_facet | Michelle A Gordy Tyler P Cobb Patrick C Hanington |
| author_sort | Michelle A Gordy |
| collection | DOAJ |
| description | Abstract Background Cercarial dermatitis, colloquially “swimmer’s itch”, is a rash contracted in natural bodies of water, when people are exposed to skin-penetrating, larval flatworm parasites of the family Schistosomatidae, that emerge from aquatic snails. Swimmer’s itch is a globally-distributed, allergic condition, of which we know very little regarding local dynamics of transmission. This study aims to gather relevant information on swimmer’s itch in Canada, from multiple perspectives, including the human experience, parasite and host presence and distributions, and insight from historical perspectives. Methods Herein we utilize a mixed-methods approach towards examining the environmental health issue of swimmer’s itch in Canadian lakes from a nation-wide viewpoint, with an example from Alberta. We examine the human perspective of having contracted swimmer’s itch through a self-reporting surveillance system implemented over a 5-year period. We also conducted a 3-year species survey of parasites and intermediate snail hosts within lakes in central Alberta and compiled this data with snail and vertebrate (definitive) host survey data from across Alberta to examine potential for future spread. We compare the results from our surveys to a historical review of the literature to examine the extent of swimmer’s itch across Canada and identify where future efforts should be focused. Results Over 3800 cases of swimmer’s itch were captured across Canada by the self-reporting surveillance system. Swimmer’s itch cases were reported from every province except Prince Edward Island. Species surveys in Alberta revealed 7 new parasite and host records, with potential for swimmer’s itch to occur throughout most of the province based on host distributions. A review and comparison to the literature has highlighted several knowledge gaps surrounding schistosome species, host species and their distributions and contributions towards swimmer’s itch. Conclusions Swimmer’s itch is a greater environmental health hazard across Canada than previous literature would have alluded. This study provides proof-of-concept for the utility of a self-reporting surveillance system for swimmer’s itch in Canada. Recommendations are made towards implementing a systems-thinking approach that incorporates citizen-scientists for future research, management, and policy surrounding swimmer’s itch. |
| first_indexed | 2024-12-17T07:33:20Z |
| format | Article |
| id | doaj.art-85777864ad6e4220b3a644d80a4adab2 |
| institution | Directory Open Access Journal |
| issn | 1476-069X |
| language | English |
| last_indexed | 2024-12-17T07:33:20Z |
| publishDate | 2018-10-01 |
| publisher | BMC |
| record_format | Article |
| series | Environmental Health |
| spelling | doaj.art-85777864ad6e4220b3a644d80a4adab22022-12-21T21:58:24ZengBMCEnvironmental Health1476-069X2018-10-0117111810.1186/s12940-018-0417-7Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the futureMichelle A Gordy0Tyler P Cobb1Patrick C Hanington2School of Public Health, 357F South Academic Building, University of AlbertaInvertebrate Zoology, Royal Alberta MuseumSchool of Public Health, 357F South Academic Building, University of AlbertaAbstract Background Cercarial dermatitis, colloquially “swimmer’s itch”, is a rash contracted in natural bodies of water, when people are exposed to skin-penetrating, larval flatworm parasites of the family Schistosomatidae, that emerge from aquatic snails. Swimmer’s itch is a globally-distributed, allergic condition, of which we know very little regarding local dynamics of transmission. This study aims to gather relevant information on swimmer’s itch in Canada, from multiple perspectives, including the human experience, parasite and host presence and distributions, and insight from historical perspectives. Methods Herein we utilize a mixed-methods approach towards examining the environmental health issue of swimmer’s itch in Canadian lakes from a nation-wide viewpoint, with an example from Alberta. We examine the human perspective of having contracted swimmer’s itch through a self-reporting surveillance system implemented over a 5-year period. We also conducted a 3-year species survey of parasites and intermediate snail hosts within lakes in central Alberta and compiled this data with snail and vertebrate (definitive) host survey data from across Alberta to examine potential for future spread. We compare the results from our surveys to a historical review of the literature to examine the extent of swimmer’s itch across Canada and identify where future efforts should be focused. Results Over 3800 cases of swimmer’s itch were captured across Canada by the self-reporting surveillance system. Swimmer’s itch cases were reported from every province except Prince Edward Island. Species surveys in Alberta revealed 7 new parasite and host records, with potential for swimmer’s itch to occur throughout most of the province based on host distributions. A review and comparison to the literature has highlighted several knowledge gaps surrounding schistosome species, host species and their distributions and contributions towards swimmer’s itch. Conclusions Swimmer’s itch is a greater environmental health hazard across Canada than previous literature would have alluded. This study provides proof-of-concept for the utility of a self-reporting surveillance system for swimmer’s itch in Canada. Recommendations are made towards implementing a systems-thinking approach that incorporates citizen-scientists for future research, management, and policy surrounding swimmer’s itch.http://link.springer.com/article/10.1186/s12940-018-0417-7Cercarial dermatitisSwimmer’s itchSchistosomeTrichobilharziaAlbertaHost-distributions |
| spellingShingle | Michelle A Gordy Tyler P Cobb Patrick C Hanington Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future Environmental Health Cercarial dermatitis Swimmer’s itch Schistosome Trichobilharzia Alberta Host-distributions |
| title | Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future |
| title_full | Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future |
| title_fullStr | Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future |
| title_full_unstemmed | Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future |
| title_short | Swimmer’s itch in Canada: a look at the past and a survey of the present to plan for the future |
| title_sort | swimmer s itch in canada a look at the past and a survey of the present to plan for the future |
| topic | Cercarial dermatitis Swimmer’s itch Schistosome Trichobilharzia Alberta Host-distributions |
| url | http://link.springer.com/article/10.1186/s12940-018-0417-7 |
| work_keys_str_mv | AT michelleagordy swimmersitchincanadaalookatthepastandasurveyofthepresenttoplanforthefuture AT tylerpcobb swimmersitchincanadaalookatthepastandasurveyofthepresenttoplanforthefuture AT patrickchanington swimmersitchincanadaalookatthepastandasurveyofthepresenttoplanforthefuture |