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Published on: November 1, 2011
In vitro method for safety testing of foot-and-mouth disease vaccines
Abstract:
The susceptibility of the tissue culture system to small amounts of residual live virus was not influenced by the inactivated antigen present. The depth of inoculum over the cell sheet did not affect results. Negative cultures frequently gave positive first (but not second or later) sub-cultures.Baby hamster kidney cells were always more sensitive than cattle tongues to infection with any of the strains used.Confidence in the safety test depends on the number of vaccination doses used; the tissue culture test can be made much more reliable than the cattle test because it is not limited to the 15 ml. of inoculum that restricts the cattle test.
Insights
Tissue culture safety tests for residual live virus are reliable, with baby hamster kidney cells showing higher sensitivity than cattle tongue tests. This method offers greater confidence in vaccine safety assessments.
Area of Science:
- Virology
- Cell Biology
- Vaccine Safety Testing
Background:
- Assessing residual live virus in vaccines is critical for public health.
- Traditional safety tests, like cattle tests, have limitations in sensitivity and sample volume.
Purpose of the Study:
- To evaluate the reliability of tissue culture systems for detecting residual live virus in vaccine batches.
- To compare the sensitivity of tissue culture methods with traditional cattle tests.
Main Methods:
- Utilized baby hamster kidney cells and cattle tongue cells for virus susceptibility studies.
- Inoculated cell cultures with varying depths and assessed viral presence through sub-culturing.
- Compared tissue culture results against limitations of the cattle test's 15 ml inoculum volume.
Main Results:
- Tissue culture susceptibility was not affected by inactivated antigen or inoculum depth.
- Baby hamster kidney cells demonstrated higher sensitivity to viral infection than cattle tongue cells.
- Negative cultures occasionally yielded positive first sub-cultures, but not subsequent ones.
Conclusions:
- Tissue culture systems provide a more reliable and sensitive method for detecting residual live virus compared to cattle tests.
- The enhanced sensitivity and lack of volume restriction make tissue culture ideal for robust vaccine safety evaluations.
