Prevalence of serum neutralizing antibodies to adenovirus type 5 (Ad5) and 41 (Ad41) in children is associated with age and sanitary conditions.

Neutralizing antibody (NAb) can dampen the immunogenicity of adenovirus (Ad) vector-based vaccine. Vector systems based on human adenovirus type 41 (Ad41) have been constructed and used to develop recombinant vaccines. Here, we attempted to study the seroprevalence of NAbs to Ad5 and Ad41 among children and adults in Qinghai province, China.

[Complete genome phylogenetic analysis of five H9N2 avian influenza viruses isolated from poultry flocks in Qinghai lake region].

Five H9N2 avian influenza virus strains were isolated from the environmental samples in live poultry market in Qinghai Lake region from July to September, 2012. To evaluate the phylogenetic characteristics of these H9N2 isolates, the eight gene segments were amplified by RT-PCR and sequenced. The phylogenetic and molecular characteristics of the five strains were analyzed.

[Molecular epidemiological study of measles viruses isolated in Qinghai Province during 2000-2011].

Objective: To carry out the molecular epidemiological study of the wild-type measles virus isolated in Qinghai Province during 2000-2011, and provide a scientific basis for the measles elimination.

Methods: Measles viruses were isolated using B95a cell line or Vero/SLAM cell line from throat swabs collected from suspected measles cases during measles outbreak and sporadic in 6 prefectures during 2000-2011. The fragment of 696 nucleotides of N gene carboxy terminal was amplified by using RT-PCR methods.

[Human enterovirus 71 that firstly isolated in Qinghai Province and their genetic features of VP1 region].

Objective: To study the genetic characterizations of VP1 gene of human enterovirus 71 (HEV71) isolated from clinical specimens of Hand, Foot and Mouth Disease (HFMD) patients in Qinghai Province in 2008.

Methods: 335 clinical samples including stools, throat swabs and vesicle fluids were collected from HFMD patients in Qinghai Province. Viral isolation was performed, and molecular typing was performed with the positive isolates.

Mosquitoes and mosquito-borne arboviruses in the Qinghai-Tibet Plateau--focused on the Qinghai area, China.

An investigation was conducted to identify the distribution of mosquitoes and mosquito-borne arboviruses in the Qinghai-Tibet Plateau, China from July to August in 2007. A total of 8,147 mosquitoes representing six species from three genera (Aedes, Culex, and Anopheles) were collected in three locations (Geermu city, altitude of 2,780 m; Xining city, 2,200 m; Minhe county, 1,700 m). Six virus isolates were obtained including Tahyna virus (TAHV), Liaoning virus, and Culex pipiens pallens Densovirus.

[Investigation on distribution of HBV genotype and serotype from Tibetan in Tongde, Qinghai].

Objective: To explore the distribution of HBV genotype and serotype from Tibetan in Tongde, Qinghai.

Methods: Nested polymerase chain reaction (nPCR) was used for amplification of S gene and C gene of HBV from sera carried by Tibetan chronic HBV carrier in Tongde, Qinghai, then the HBV DNA positive products were sequenced by direct sequencing. Genotype and serotype were identified by analysis of sequence result.