RAPID RISK ASSESSMENT Local transmission of Schistosoma haematobium in Corsica , France 16 May 2014 (original) (raw)
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Evidence for a permanent presence of schistosomiasis in Corsica, France, 2015
Euro surveillance : bulletin Européen sur les maladies transmissibles = European communicable disease bulletin, 2016
We present a case of acute schistosomiasis acquired in Corsica after bathing in the Cavu River during the summer of 2015. The diagnosis was made following epidemiological, laboratory and serological assessments. After a previous outbreak of urogenital schistosomiasis during the summer of 2013, when more than 120 infections were diagnosed, this further case indicates transmission was still effective in 2015, thus suggesting a permanent presence of schistosomiasis in Corsica.
Schistosoma haematobium infections acquired in Corsica, France, August 2013
Eurosurveillance, 2014
A 12 year-old boy in Germany developed urinary schistosomiasis in January 2014. He had bathed in rivers in south-eastern Corsica five months earlier. Before this case, human schistomiasis had not been reported on the island, although its vector, the snail Bulinus truncatus, locally transmitted the zoonotic Schistosoma bovis. The boy's father excreted S. haematobium ova that were not viable; the boy's three siblings had a positive serology against schistosomes.
Outbreak of urogenital schistosomiasis in Corsica (France): an epidemiological case study
The Lancet Infectious Diseases, 2016
Environmental and anthropogenic changes are expected to promote emergence and spread of pathogens worldwide. Since 2013, human urogenital schistosomiasis is established in Corsica island (France). Schistosomiasis is a parasitic disease affecting both humans and animals. The parasite involved in the Corsican outbreak is a hybrid form between Schistosoma haematobium, a human parasite, and Schistosoma bovis, a livestock parasite. S. bovis has been detected in Corsican livestock few decades ago raising the questions whether hybridization occurred in Corsica and if animals could behave as a reservoir for the recently established parasite lineage. The latter hypothesis has huge epidemiological outcomes since the emergence of a zoonotic lineage of schistosomes would be considerably harder to control and eradicate the disease locally and definitively needs to be verified. In this study we combined a sero-epidemiological survey on ruminants and a rodent trapping campaign to check whether schistosomes could shift on vertebrate hosts other than humans. A total of 3,519 domesticated animals (1,147 cattle; 671 goats and 1,701 sheep) from 160 farms established in 14 municipalities were sampled. From these 3,519 screened animals, 17 were found to be serologically positive but were ultimately considered as false positive after complementary analyses. Additionally, our 7-day extensive rodent trapping (i.e. 1,949 traps placed) resulted in the capture of a total of 34 rats (Rattus rattus) and 4 mice (Mus musculus). Despite the low number of rodents captured, molecular diagnostic tests showed that two of them have been found to be infected by schistosomes. Given the low abundance of rodents and the low parasitic prevalence and intensity among rodents, it is unlikely that neither rats nor ruminants play a significant role in the maintenance of schistosomiasis outbreak in Corsica. Finally, the most likely hypothesis is that local people initially
Tropical Medicine and International Health, 1999
A village with mixed Schistosoma mansoni and S. haematobium infections (probably in a early endemic phase) was identified around the Lac de Guiers in the Senegal River Basin. In documenting the epidemiology of both schistosomes, we focused on prevalence and intensity of infection, transmission patterns and the impact of treatment. S. mansoni prevalences (near 100%) and egg counts (overall geometric mean eggs per gram of faeces (epg) of 589 were high in all age groups, with 35% of individuals excreting Ͼ 1000 epg, and showing a slow decline in egg output only after the age of 30 years. The overall prevalence (28%) and egg counts (2% Ͼ 50 eggs/10 ml) of S. haematobium were low, with mean counts of 6.3 eggs/10 ml. Maximal mean S. mansoni egg counts were found in 5-9 year-old boys and in 15-19 year-old girls; S. haematobium maximal counts in 1-4 year-old boys and in girls aged 5-9. Extremely high Biomphalaria pfeifferi infection ratios were recorded over the whole year. Following a single treatment, re-infection was rapid with prevalences and mean egg counts of both Schistosoma species reaching pretreatment levels within 7 months.
The epidemiology of human schistosomiasis in the Senegal river basin
Transactions of the Royal Society of Tropical Medicine and Hygiene, 1996
Extensive water development has taken place in the north of Senegal over the last decade, resulting in a large increase in the amount of fresh water for irrigation. The objectives of the present study were to determine the prevalence and intensity of Schistosoma mansoni and S. haematobium in the Senegal river basin (SRB), and to ascertain the distribution of the snail species acting as intermediate hosts for both species of schistosomes. The schistosomiasis survey started in January 1994 and was completed in March 1995. Compared to studies before the construction of the Diama dam, there was a significant increase in both the prevalence and intensity of urinary and intestinal schistosomiasis in the human population in parts of the SRB. From the 9014 people who were registered from 180 villages and 4 towns (10 districts), 7750 were examined. S. mansoni was found in the lower valley (lower delta-Senegal river, lower delta-Lampsar river, upper delta, and dieWe') but not in the middle valley. The mean prevalence ranged from 4.4% in the lower delta-Senegal River to 71.8% in the zone of Lac de Guiers, where prevalence and intensity of infection were higher on the eastern side of the lake (81.3% with a mean number of 2088 eggs/g of faeces) compared with the western side (50.3% with a mean 1111 eggs/g). S. h aematobium was recorded throughout the area of study, ranging from a mean prevalence of 0.37% in d&e (lower valley) to 415% in the lower valley (Lampsar river), where the mean egg count was 313/10 mL of urine. Physical and chemical changes to the environment have favoured the spread and increase in the populations of freshwater snails. The only snail involved in the transmission of S. mansoni was Biomphalaria pfeifiri. Five species of bulinid snails were present-Bulinus globosus, Bu. umbilicatu!, Bu. senegalensis, Bu. forskalii and Bu. truncatus-but only the first 3 species were involved in the transmission ofS. haematobium in the lower and middle valleys.
International Journal of Epidemiology, 1996
Background. Schistosomiasis (Schistosoma mansoni) is classically described as a rural disease that occurs in areas with poor sanitary conditions. This cross-sectional study was undertaken in a suburban area of a large industrialized city in Brazil (Belo Horizonte), aiming at examining epidemiological characteristics of schistosomiasis in an urban setting. Methods. A simple random sample of 658/1896 dwellings was selected and 3049/3290 (92.7%) residents were submitted to stool examination. Of 518 eligible infected cases and 518 uninfected controls, 87.1% and 89.8% participated in the study, respectively. Results. The prevalence of S.mansoni infection was 20%, predominantly low egg counts in stools; no cases of splenomegaly were found. Signs and symptoms associated with infection were bloody stools (odds ratio [OR] = 8.0) and hardened palpable liver at the middle clavicular and at the middle sternal line (OR = 5.5 and 8.0, respectively). Sociodemographic variables and water contacts predictive of infection were age (10-19 and s=20 yrs; OR = 7.1 and 3.3, respectively), gender (male; OR = 3.1), contacts for swimming and/or playing (twice a month or less and more than twice a month; OR = 2.2 and 3.0, respectively) and residence in Belo Horizonte (born in the City; OR = 2.5). Ninety per CRnt of dwellings had a piped water supply; no association between water supply and infection was found. Conclusion. Our results emphasize the need for schistosomiasis control measures focusing on water contacts for leisure purposes in this industrialized urban area.
Journal of Biochemistry, Microbiology and Biotechnology, 2023
Microscopic examination of urine samples from individuals has long been regarded as the gold standard for diagnosing Schistosoma haematobium infection in Nigeria. However, the reliability of this method has been questioned. In light of this, the present study was designed to conduct an Epidemiology and Molecular Study of S. haematobium Infection Among People in Riverine Communities of Sokoto State. A total of 900 urine samples were collected. These samples underwent microscopic examination after filtration. Positive samples underwent DNA extraction, followed by PCR analysis to detect the presence of Schistosoma haematobium at 121 base pairs. Microscopically, 315 out of 900 samples (35.0%) tested positive for Schistosoma haematobium, with a mean egg intensity of 45.3 eggs per 10 mL of urine. The prevalence was notably high among fishermen (57.1%), individuals using any available water source (100.0%), visitors to freshwater bodies (37.7%), those residing very close to freshwater bodies (41.5%), and individuals who urinated indiscriminately (70.0%). The intensity of infection was significantly elevated among housewives (56.5%), visitors to freshwater bodies (58.7%), and individuals who urinated directly into freshwater bodies (57.2%). PCR analysis further confirmed the presence of Schistosoma haematobium in 87.6% of the samples previously analyzed microscopically. Infection rates were particularly significant among fishermen (98.2%), individuals using rivers as their water source (99.1%), visitors to freshwater bodies (89.8%), swimmers (97.8%), those residing very close to freshwater bodies (98.6%), and individuals who urinated directly into freshwater bodies (98.9%). The study revealed that microscopic examination alone may not be entirely effective in the study area. Therefore, the adoption of binary diagnosis methods is strongly recommended for more efficient detection of Schistosoma haematobium in the State.
IJCRM, 2016
This study was conducted to determine the water related activities and prevalence of Schistosoma haematobium in some communities of Fufore Local Government Area of Adamawa State Nigeria. Out of 618 samples were collected within three months, from September to November 2014 andparasitologically examined for eggs of S . haematobium using the sedimentation method, questionnaires were also administered to participants toobtaininformation on demographic data and water contact activities. Of the 618 samples collected 31 were infected giving an overall prevalence of 5.02%. Infection was recorded mainly among those who had contact with water bodies 8.05% whereas those using well water recorded the highest prevalence 4.37%.People who visited mainly for recreational purposes like swimming and playing were the most infected 6.30%.No infection was recorded for those who visited for Farming and Fishing (P>0.05). In conclusion, though prevalence is low, it is important to intensifycontrol measures in order eradicate the disease from this region. Routine treatment and monitoring of the infected dams is recommended so as to reduce the rate of transmission of the disease and also recreational sites and activities should be created in endemic areas to reduce the frequency of visits of the inhabitants to the infected dams, andalso infected persons should be treated.