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Enhanced toxicity for mice of pertussis vaccines when preserved with Merthiolate
Abstract:
Pertussis vaccines preserved with 0.01% Merthiolate are more toxic for mice than unpreserved vaccines prepared from the same parent concentrate and containing the same number of organisms. The toxicities of both Merthiolate (0.01%)-preserved and unpreserved vaccines increased when the number of organisms injected was increased. An increase in mortality was observed when Merthiolate was injected separately, before or after an unpreserved saline suspension of pertussis vaccine.
Insights
Pertussis vaccines preserved with Merthiolate show increased toxicity in mice compared to unpreserved vaccines. This toxicity is linked to both the preservative and the number of pertussis organisms administered.
Area of Science:
- Immunology
- Vaccinology
- Toxicology
Background:
- Pertussis vaccines are crucial for preventing whooping cough.
- Preservatives are often added to vaccines to ensure stability and prevent microbial contamination.
- Merthiolate (thimerosal) is a preservative historically used in some vaccines.
Purpose of the Study:
- To investigate the toxicity of Merthiolate-preserved pertussis vaccines in a mouse model.
- To determine the impact of preservative presence and bacterial load on vaccine toxicity.
- To assess the toxicity of Merthiolate when administered independently of the vaccine.
Main Methods:
- Comparison of toxicity between Merthiolate-preserved and unpreserved pertussis vaccines in mice.
- Administration of varying concentrations of pertussis organisms in both preserved and unpreserved vaccine formulations.
- Evaluation of Merthiolate toxicity when injected separately from the pertussis vaccine suspension.
Main Results:
- Merthiolate-preserved pertussis vaccines exhibited higher toxicity in mice than unpreserved vaccines.
- Increased bacterial load in both vaccine types correlated with heightened toxicity.
- Separate administration of Merthiolate, before or after the vaccine, also increased mortality.
Conclusions:
- The preservative Merthiolate contributes to the toxicity of pertussis vaccines.
- Vaccine toxicity is influenced by both preservative content and the number of encapsulated organisms.
- Further research into vaccine components and their toxicological profiles is warranted.