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Biomedical subjects

L B HOLT

Publications and source records attributed to L B HOLT.

At least 19 recordsLinked to original sources

PROPHYLAXIS AGAINST TETANUS: AN INVESTIGATION INTO EFFICIENCY OF A METHOD.

A study has been made by clinical methods and by bio-assay of the effectiveness of a régime for prophylaxis against tetanus. The two principal objects of the method were to ensure that active immunization was offered to all patients who had received antitoxin and to measure the effect of the combined administration of toxoid and antitoxin. Because of a high incidence of failure to re-attend, 63.9% of patients requiring protection against tetanus would never have begun a course of active immunity unless toxoid had been given at the first attendance. The administration of antitoxin at the same time as the toxoid is given does not interfere with the latter's ability to provoke an immune response. A second injection of fluid toxoid produced a satisfactory immune response in 80.6% of subjects whose first dose had been given simultaneously with antitoxin.

Antibodies↗

A comparison of the antigenicity characteristics of mixed antigens in the child and the guinea-pig.

Parallel dose-response experiments were carried out in infants and guinea-pigs employing mixed antigens, e.g., diphtheria formoltoxoid (plain) mixed with H. pertussis vaccine, and with H. pertussis vaccine and tetanus toxoid (plain).It is found that the slopes of the dose-response regression lines, particularly in respect of the diphtheria antitoxin responses, are so greatly different in the two species that the guinea-pig cannot be used as a test-animal for response in children and that the concept of "units of antigenicity" receives no practical support.Since the adjuvant effect of pertussis vaccine on formol-toxoid appears to be inconstant, it is suggested that this property be regarded solely as a "bonus" to the intrinsic antigenic activity of the toxoid and that, for purposes of laboratory control of such mixed antigens, the toxoids should be tested against the International Toxoids (plain) alone, i.e., not mixed.

Animals↗