To investigate the cause of death of a pregnant woman with undefined pneumonia reported from the People´s Hospital of Tongling City in Anhui Province on November 8,2005,the patient´s tracheal aspirates and serum samples were collected and tested by RT-PCR and Real-time PCR to detect viral nucleic acids of HA of A/H5N1,A/H7N7,A/H9N1 and A/M.Tracheal aspirates were inoculated into special pathogen free(SPF) embryonated eggs for cultivation and identification of virus.The HA gene of the virus was sequenced and...