RESUMO
The present investigation examined the prevalence and intensity of pinworm infection in laboratory mice from three laboratory animal centres in China's southern Guangdong Province between August 2008 and April 2009. A total of 301 laboratory mice representing BALB/c, Kunming (KM) and C57BL/6J breeds were examined and the worms were counted and identified according to existing keys and descriptions, and their specific identity was ascertained by polymerase chain reaction (PCR) amplification of the second internal transcribed spacer (ITS-2) of ribosomal DNA. While the BALB/c and C57BL/6J mice were not found to be infected with pinworms, postmortem examination of the KM mice revealed a prevalence of 46.7%. PCR amplification of ITS-2 rDNA and subsequent sequencing confirmed that the mice were infected with Syphacia obvelata. The results of the present investigation demonstrated that the prevalence of pinworm infection in laboratory mice was high in the Guangdong province, and integrated control strategies and measures should be implemented to prevent and control pinworm infection in laboratory mice.