trial transmission
1.During six months trial operation,various performance indexes meet the design requirements,the transmission of GPRS network is stable,the safety and reliable operation and the production of enterprise are ensured. The design strategy is proven with certain applicable values.
2.Methods One hundred and ninety nine children aged 4～7 years without anti HAV and with normal ALT level have been screened out at two trial fields in Anning, Kunming and divided into vaccinee group(82 children)and contact group (117 children) to observe the horizontal transmission of the live attenuated hepatitis A vaccine virus (H2 strain).
