Objective To investigate the alien snails in Dapeng Peninsula Shenzhen City. Methods The survey on the snail diversity in Dapeng Peninsula was carried out from August 2012 to Jan 2013 and the species of the alien snails were iden?tified according to the shell morphology. Results Four species of alien snails including Achatina fulica Pomacea canalicula?ta Physa acuta and Biomphalaria straminea were found in Dapeng Peninsula P. acuta was found in all of the collected sites A. fulica and P. canaliculata were distributed in five regions except Yangmeikeng area and B. straminea was just found in Dapeng Town. Conclusion Four species of important alien snails invade widely in Dapeng Peninsula Shenzhen City. As their potential risk to the disease transmission and agriculture production the relative departments should strengthen the control and prevention.

Objective To assess the clinical outcome of short segment fixation in combination of pedicle screw in injured vertebrae for thoracolumbar fractures. Methods Twenty-one cases of thoracolumbar fractures received short segment fixation combined with pedicle screw in injured vertebrae surgery. The protruding after angle correction and vertebral body height recovery situation were measured by X-ray film before and after surgery. Results All the patients were followed up for 6~20 months,achieved good reduction effect. The imaging measure-ment results found that before the operation Cobb’s angle was (26. 4 ± 7. 3),fracture fanterior flange height was (56. 1 ± 12. 5)%. Com-pared with after the operation and the end of follow-up of Cobb’ s and fracture fanterior flange height,the difference had statistical significance (P<0. 05). But between after the operation and the end of the follow-up of Cobb’s and fracture fanterior flange height,the difference had no statistical significance (P>0. 05). Conclusion Short segment fixation in combination of pedicle screw in injured vertebrae can restore the height of vetebra,rectify protrusion deformity,which is an effective method for thoracolumbar fracture.