Abstract
Serum samples from 77 guinea pigs immunized against tetanus have been titrated for tetanus antitoxin by a standardized indirect haemagglutination (IHA) test and the conventional toxin neutralization (TN) test. These sera were titrated before and after treatment of the sera with 2-mercaptoethanol (2-ME) by the IHA test using unfixed sheep erythrocytes and erythrocytes fixed with glutaraldehyde, formaldehyde and pyruvic aldehyde. The titres of these sera obtained by IHA using unfixed and glutaraldehyde-fixed sheep erythrocytes before treatment of the sera with 2-ME were two to six times higher than the TN titres, whereas the IHA-titres using formaldehyde- and pyruvic aldehyde-fixed sheep erythrocytes were 10 times higher than the TN titres in some of the sera. There was no statistically significant difference between TN and IHA titres using unfixed and glutaraldehyde-fixed sheep erythrocytes after the treatment of the sera with 2-ME.
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