Why ultra low temperature storage for vaccines?
Vaccines contain components that are susceptible to degradation when exposed to higher temperatures. Exposure at higher temperatures can lead to denaturation of proteins, loss of potency, and reduced effectiveness. Ultra low temperature storage prevents such undesirable outcomes and maintains the vaccine's ability to confer immunity.
Some key components that are particularly sensitive to degradation include:
Proteins:
Many vaccines contain proteins, such as antigens or adjuvants, which are crucial for triggering an immune response. Exposure to elevated temperatures might lead to protein denaturation, rendering them ineffective.1
Nucleic Acids:
Certain vaccines, especially those based on nucleic acid platforms like mRNA vaccines, carry genetic information. High temperatures can degrade the nucleic acids, affecting the vaccine's ability to instruct cells to produce the desired immune response.2
Enzymes:
Some vaccines include enzymes that play a role in the formulation or activation of the vaccine. Exposure to higher temperatures can compromise the activity of these enzymes, impacting the vaccine's efficacy.
Preservatives and Stabilizers:
To enhance shelf life and stability, vaccines often contain preservatives and stabilizers. Examples include thimerosal, formaldehyde, and phenol. Unlike the other vaccine components, these additives do not necessarily require ultra-low-temperature storage. Elevated temperatures may still impact their effectiveness.1 2 3 4