A total of 60 samples were collected from 35 swimming pools in Beijing, China, and the presence of Cryptosporidium and Giardia were investigated. The results showed that 16.7% and 15.0% of samples were positive for Cryptosporidium oocyst and Giardia cysts, respectively, with a mean concentration of 0.30 oocysts/10 L and 0.27 cysts/10 L. The oocysts and cysts were found to have higher rates of occurrence in August than in May. Genotyping confirmed the presence of Cryptosporidium hominis, C. parvum, and Giardia assemblages A and B, all of which were associated with human infections. The predominant species/assemblages were C. hominis and Giardia assemblage A. Analyses of the relationships between parasite oocysts/cysts, indicator bacteria, and physical-chemical parameters revealed that there was no correlation between 2 parasites and fecal bacterial indicators, whilst there was a significant correlation between protozoa and urea concentration, which indicates that urea concentration rather than fecal bacterial indicators might be an appropriate index for chlorine-resistant protozoa in swimming pools. This study provides useful information to improve the safety of swimming pool water and deduce the risk of protozoan infections.
Bacteria ; Beijing ; China ; Cryptosporidium* ; Giardia* ; Humans ; Oocysts ; Parasites ; Protozoan Infections ; Swimming Pools* ; Swimming* ; Urea ; Water Quality* ; Water*

Objective To observe the effect of rhBMP-2 (bone Guide) in the treatment of femoral neck fracture. Methods In our hospital from January 2016 to May 2017, 86 patients with femoral neck fracture were randomly divided into observation group and control group, 43 cases in each group. The observation group was treated with closed reduction and cannulated screw fixation compared with cannulated screw tunnel rhBMP-2 (recombinant human bone morphogenetic protein-2) implantation for the treatment of the control group. Observe the curative effect and adverse reaction. Results The observation group's bone healing rate and hip joint function score higher than the control group, and intraoperative blood loss and postoperative bed time, bed time, fracture healing time, time, the incidence of femoral head necrosis, incidence of complications were lower than those in control group. The difference was significant (P＜0.05); there was no significant difference between the two group operation time (P＞0.05). Conclusion The treatment of femoral neck fracture with bone guide and percutaneous screw placement has good therapeutic effect, and it can prompt patients to recover as early as possible and reduce the occurrence of osteonecrosis of the femoral head.