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This New ‘Ensilication’ Method Allows Childhood Vaccines To be Kept Safe In All Temperatures

The technique for tailor-fitting a vaccine with a silica coat - known as ensilication, keeps vaccines safe in all temperatures

Vaccines are difficult to transport to remote or dangerous places, as they spoil when not refrigerated but now researchers have developed a way to prevent warmed-up vaccines from degrading. By encasing protein molecules in a silica shell, the structure remains intact even when heated to 100 degrees Celsius, or stored at room temperature for up to three years. The technique for tailor-fitting a vaccine with a silica coat – known as ensilication- was developed by Bath University researchers in collaboration with the University of Newcastle in the UK.

This pioneering technology was seen to work in the lab two years ago, and now it has demonstrated its effectiveness in the real world too. “The aim is to eradicate vaccine-preventable diseases in low-income countries by using thermally stable vaccines and cutting out dependence on cold chain,” said study researcher Asel Sartbaeva from the University of Bath. Currently, up to 50 per cent of vaccine doses are discarded before use due to exposure to suboptimal temperatures.

vaccines
The technique for tailor-fitting a vaccine with a silica coat – known as ensilication- was developed by Bath University researchers in collaboration with the University of Newcastle in the UK. Pixabay

According to the World Health Organisation (WHO), 19.4 million infants did not receive routine life-saving vaccinations in 2018. In their latest study, published in the journal Scientific Reports, the research team sent both ensilicated and regular samples of the tetanus vaccine from Bath to Newcastle by ordinary post (a journey time of over 300 miles, which by post takes a day or two).

This project has focused on tetanus, which is part of the DTP (diphtheria, tetanus and pertussis) vaccine given to young children in three doses. When doses of the ensilicated vaccine were subsequently injected into mice, an immune response was triggered, showing the vaccine to be active. No immune response was detected in mice injected with unprotected doses of the vaccine, indicating the medicine had been damaged in transit.

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“This is really exciting data because it shows us that ensilication preserves not just the structure of the vaccine proteins but also the function – the immunogenicity,” Sartbaeva said. “Eventually, we want to create a silica cage for the whole DTP trivalent vaccine, so that every child in the world can be given DTP without having to rely on cold chain distribution,” the authors wrote.

Also Read: Devotees Rushed To Religious Places as Nationwide Lockdown Lifted

Silica is an inorganic, non-toxic material, and researchers estimate that ensilicated  vaccines could be used for humans within five to 15 years. They hope the technology to silica-wrap proteins will eventually be adopted to store and transport all childhood vaccines, as well as other protein-based products, such as antibodies and enzymes. (IANS)

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