The Covid-19 pandemic threatens every one of us, wherever we are, which has demanded a new global approach to vaccine development. There has been unprecedented international attention, cooperation and use of resources, enabling us to act at speed to stop people dying and protect livelihoods.
For most diseases, developing a vaccine can take more than 10 years. The development process is expensive, so to keep costs down development takes place slowly, each stage only beginning when the previous stage is successfully completed.
This has meant a fundamental redesign of the staggered approach of conventional vaccine development, so that Covid-19 vaccine development can safely be done much faster.
So far, it has been an extraordinary success – a brilliant example of what we can achieve when we work together.
It’s a bit like driving across a busy city in rush hour. Normally you spend lots of time waiting at traffic lights, but when you have a police escort, you can take the same journey and get to the same place, just as safely, but faster.
All licensed vaccines currently available have been made using a traditional vaccine development model. Because of the high costs and failure rate, this usually follows a linear sequence of steps.
There are five stages to the process:
Using this approach, a vaccine would usually take more than 10 years to be developed and cost between $200 and $500 million.
Each of these stages happens in sequence, one after the other. At each stage, and between stages, there would be a lot of waiting.
With Covid-19, we couldn’t afford to wait. Because of how deadly and disruptive Covid-19 is, we simply had to find ways to speed up the usual vaccine development approach.
Developing Covid-19 vaccines in one year instead of 10 has been a monumental task. To succeed, new collaborative approaches to science and global manufacturing and distribution have been created.
The result has been faster vaccine development than we’ve ever seen, but without cutting back on testing and safety measures.
This has been possible thanks to public, private and philanthropic collaboration and investment on a never-before-seen level.
The investment needed for Covid-19 vaccine development is significant. $2 billion has been spent by COVAX(opens in a new tab) alone, and they require a further $6.8 billion in 2021 to achieve their goal of delivering 2 billion vaccine doses globally(opens in a new tab).
While this sounds costly – at least four times the cost of usual vaccine development – it’s a good investment, given that we’re losing $375 billion(opens in a new tab) from the global economy every month due to the pandemic.
To work together at speed, researchers, developers and funders have had to seek three things:
To work at speed has meant carrying out different stages of development and production at the same time, to get to a vaccine faster.
Vaccine trials have been carried out in parallel around the world, not just in high-income countries, to give us the best chance of finding vaccines that are safe and effective for everyone.
We didn’t and still don’t know where the best Covid-19 vaccines will come from, so teams are trying as many different innovations and technologies as possible. This gives us the best chance of finding ones that work, and a diversity of vaccines with different requirements to make sure they work in a variety of contexts and populations.
To meet the demand for the billions of doses of Covid-19 vaccines (in addition to all the other routine vaccines that still need to be manufactured, such as MMR and polio) requires various steps to be taken:
This explainer was originally published in April 2020 and updated in January 2021.