RESUMEN
Objective To know the contamination status of Giardia lamblia and Cryptosporidium in drinking water of Jiangsu Province, so as to provide the evidence for producing hygiene and safety drinking water. Methods A total of 28 water plants of 13 cities in Jiangsu Province were selected, and the source water (10 L), chlorinated water (100 L) and tap water (100 L) were collected separately in each site. The water samples were then treated by filtration, washing, centrifuging concentration, immune magnetic separation, and immunofluorescent assay, to detect the numbers of Giardia cysts and Cryptosporidium oocysts. Results Totally 84 samples from 13 cities were collected, including 28 source water, 28 chlorinated water and 28 tap water samples. Among the chlorinated water and tap water samples, no Giardia cysts and Cryptosporidium oocysts were found. However, Giardia cysts were detected in 3 (10.71%, 3/28) source water samples (Yancheng, Lianyungang, Changzhou cities), with the density of 1 cyst/10 L of all. Cryptosporidium oocysts were also detected in 3 (10.71%, 3/28) source water samples (Nanjing, Zhenjiang, Yangzhou cities), with the density of 1 oocyst/10 L of all. Conclusions The source water in partial areas of Jiangsu Province has been contaminated by Giardia and Cryptosporidium. To ensure the safety of drinking, the regulation of source water and surveillance of drinking water should be strengthened.
Asunto(s)
Cryptosporidium/aislamiento & purificación , Agua Potable/parasitología , Giardia/aislamiento & purificación , Oocistos/aislamiento & purificación , Animales , China , Abastecimiento de AguaRESUMEN
Objective To investigate the prevalence of Toxoplasma gondii infection and related knowledge and behavior among special population in Changzhou City, so as to provide the evidence for formulating effective measures of toxoplasmosis prevention. Methods The pregnant women and patients with neoplasia in Changzhou hospitals, and livestock and poultry breeding or processing workers were selected as the subjects of the study. Venous blood samples were collected from each participant for detecting IgG and IgM antibodies against T. gondii by ELISA. A questionnaire investigation on knowledge and behavior about T. gondii infection was conducted. Results Among the total 300 respondents investigated from March to May, 2015, the prevalence of T. gondii infection was 16.3% (49/300). Totally 52 respondents knew the knowledge about the prevention and control of T. gondii infection with an awareness rate of 17.3% (52/300). The proportion of participants who frequently contacted with cats/dogs (25.0%, 13/52) in the group who knew the knowledge about the prevention and control of T. gondii infection was lower than that of participants (50.8%, 126/248) in the group who did not know the knowledge about the prevention and control of T. gondii infection, and the difference was statistically significant (χ2 = 11.51, P < 0.05). The proportion of participants separating chopping boards for raw and cooked food (61.5%, 32/52) in the group who knew the knowledge about the prevention and control of T. gondii infection was statistically higher than that of the participants (9.3%, 23/248) in the group who did not know the knowledge about the prevention and control of T. gondii infection, and the difference was statistically significant (χ2 = 78.43, P < 0.001). There was a negative correlation between the awareness rate of the knowledge about the prevention and control of T. gondii infection and the infection rate of T. gondii. The infection rate of T. gondii (5.8%, 3/52) in the group who knew the knowledge about the prevention and control of T. gondii infection was lower than that (18.5%, 46/248) of the group who did not know the knowledge about the prevention and control of T. gondii infection, and the difference was statistically significant (χ2 = 5.14, P < 0.05). Conclusions The awareness rate of the knowledge about the prevention and control of T. gondii infection among special population in Changzhou City is low. The health education on the knowledge of the prevention and control of toxoplasmosis should be strengthened, in order to improve the awareness of personal hygiene and change the unhealthy lifestyles and dietary habits.