Forty-four guinea-pigs were sensitized by intramuscular inoculation with the same amount (0.8ml) of 5% egg albumin in water. 3 weeks after sensitization, the animals were rondomly divided into 1 groups (group J as control; group II given small dose of piperitone 0.08ml/ 100g body weight; group J given large dose of piperitone 0.12ml/100g body weight; group IX given promethazine 2.5mg 100g body weight) and subjected to anaphylactic insult by intra-cardiac injection of 1ml of 5% egg albumin in water under the protection of different dosege of piperitone, a terpene from cymbopogon distans. given intramuscularly. Results of the experiment indicates that piperitone had significant dose-effect relation protective effect against the anaphylactic insult on the guinea-pigs and suggests that piperitone might be used clinically for the treatment of asthma

AIM:To explore the characteristics of hepatitis B virus S gene mutation in the vertical transmission after active and passive vaccination .METHODS:Fifteen cases of immunoprophylaxis failure were enrolled in the study . HBV S gene (including pres-S and S) from the mothers, newborns before active and passive vaccination and 7-month-old infants with immunoprophylaxis failure were detected by PCR amplification .The characteristics of HBV S gene mutation were compared among the 3 groups.RESULTS: The genotype of HBV in the newborns and the infants was the same as that in the mothers .The frequencies of mutation in the 2 fragments of the HBV S gene had no significant difference between the 3 groups.The homology tree model based on HBV S gene was analyzed in the 3 groups, in which every group had their own cluster.There were 15 different mutation sites between 7 pairs of mothers and newborns .There were 3 different muta-tion sites between 3 pairs of newborns and infants (nt273A→A/G, nt512C→C/T and nt1139C→A), among which the first 2 were located in the S gene region but not in the “a” determinant , and the latter was located in the overlap region of S and X genes .There were 25 different mutation sites between 9 pairs of mothers and infants , but only 1 case had a differ-ent mutation site between the mother , newborn and infant .CONCLUSION: The HBV species in newborns and infants with immunoprophylaxis failure were transmitted from the mothers .The mutations in the HBV S gene with immunoprophy-laxis failure happened before and after active and passive vaccination , mainly before vaccination .The relationship between HBV S gene mutations and immunoprophylaxis failure should be further explored .