Comparison of the infected mouse brain by Nakayama and Beijing -1 strain for Japanese Encephalitis vaccine production

Using white Swiss mouse at 3-4 weeks of age for injection of Japanese Encephalitis (JE) virus. Every 8 lots of the mouse had been infected with Nakayama and Beijing-1 strains by injection of 0.03ml into their brains, then followed up within 3 days. The paralysed mice were collected at the 69th hour of the beginning and at the 120th hour of the end. The interval between collection time was every 3 hours. In this study, the rate of mice with paralysis due to Beijing-1 strain was higher than those due to Nakayama strain (94.99% and 92.97%, respectively). The authors suggested that use of Beijing-1 strain to produce JE vaccine is more effective than Nakayama strain.

Study on risk factors of HIV transmission among men who have sex with men in Ho Chi Minh city

Study 600 men who have sex with men (MSM) over 15 years old in Ho Chi Minh City. Results: MSM group had complex sexual relations by oral sex and anal sex, with female partners and sex workers, and often used drugs. It’s necessary to have some intervention approaches in order to decrease HIV infection in this group.

Social - demographic and behavioral characteristics in men having sex with men in Ho Chi Minh city

A cross-sectional study was conducted in HCM City in April-May 2004 on 600 men who have sex with men (MSMs) in order to identify the risk factors of HIV transmission for elaborating a specific interventions . Results showed that a big group of MSM was constituted with a private service system. In this group, various high risk sex behaviors were practised : in average, sex buyer- 28,9%, sellers-36,5%, anal sex with male partners-2,7% in the last recent months, no more 60% of men using condom in sex relation; in the last 6 months a rather low rate in this group-16,6% using condom in sex relation with normal women, with a very low rate-26,3% often using condom. In this group, there were 1,7% using intravenous drug in the last 12 months

Degradation, half-life and residual effects of pyrethroid impregnated nets on an.dirus

This study was performed at Hanoi University of Natural Sciences and National Institute of Malaria and Parasitology from April 2001 to May 2002. Biological trials on laboratory strains of An. dirus were carried out according to WHO/VCB/81.806; WHO/CDS/CPC/MAL/98.12 and WHO/VCB/89.981. Analyses were conducted by the method of fluid-fluid extraction with the solvent system of n-hexan. Fendona 10SC,Icon 2,5CS,K-othrin ISC, Imperator 50EC .soaked mosquito bednet had manifested insecticide effect. Their effect of killing An.dirus was maintained for 5 -6 months. The procedure of analysis of pyrethroide compounds in use for soaking mosquito bednet was established and the half live of 125-188 day long period for each compound was determined