control of typhoid fever in bangkok, thailand, by annual immunization of schoolchildren with parenteral typhoid vaccine. | the number of cases of typhoid fever in bangkok, thailand, began to increase sharply in 1974 and peaked in 1976. in 1977, as part of a national typhoid immunization program, thai schoolchildren aged seven to 12 years began to receive annually a single 0.25-ml subcutaneous dose (2.5 x 10(8) organisms) of a heat/phenol-inactivated typhoid vaccine. isolations of salmonella typhi in bangkok decreased from 880 (4.6% of all blood cultures) in 1976 to 54 (0.3% of all blood cultures) in 1985. the case r ... | 1987 | 3438648 |