[Immunity to diphtheria of African guest workers and students]

This study investigated the immuno-protective diphtheria antitoxin titres of 38 guest workers from Mozambique and 44 students from Cameroon 18 to 35 years of age. Two methods were used to analyse the sera: the cell culture method and the indirect haemagglutination test. The results of both methods were comparable. Approximately 69% of the guest workers from Mozambique showed protective diphtheria antitoxin levels (> or = 0.1 IE/ml), 24% had a boosterrequiring basic immunity (> or = 0.01-0.09 IE/ml), whereas 7% showed no protective diphtheria antitoxin levels. This compared with 46, 35 and 19% respectively among the students from Cameroon.