It’s funny how some things we take for granted now were once just… not there. Chickenpox, that itchy, blistery rite of passage for so many of us growing up, is one of those things. You might be wondering, when did we actually get a handle on it with a vaccine?
Well, the story of the chickenpox vaccine, or the varicella vaccine as it's technically known, is a bit of a journey. The virus itself, varicella-zoster, has been around forever, causing both chickenpox in childhood and later, shingles in adulthood. The idea of a vaccine to prevent that initial bout of chickenpox really started gaining traction in the latter half of the 20th century. The first varicella vaccine was actually licensed in Japan way back in 1986. Following that, the United States approved its own version, Varivax®, in 1995. So, while it might feel like a relatively recent addition to our medical toolkit, the development and approval process has been unfolding for decades.
What’s interesting is how its integration into routine childhood immunisation programmes has varied across different countries. For a long time, it wasn't a standard part of the schedule everywhere. But as we’ve learned more about the virus and the benefits of widespread vaccination, recommendations have evolved. Just recently, in November 2023, the Joint Committee on Vaccination and Immunisation (JCVI) in the UK recommended that a chickenpox vaccine be added to the routine childhood immunisation programme. Their proposal is for a two-dose regimen, typically given at 12 and 18 months of age, with a potential catch-up programme for older children who might have missed out, especially given the dip in cases during pandemic restrictions.
It’s also worth noting that the vaccine is generally considered safe, even for pregnant women, though it's usually not recommended during pregnancy as a precaution. Studies, like those monitored by a registry established in the USA in 1995, have looked closely at outcomes for babies whose mothers received the vaccine inadvertently before or during pregnancy. The findings have been reassuring, showing no increased risk of birth defects compared to the general population. This ongoing research and monitoring are crucial for building confidence and ensuring these vaccines are used effectively and safely.
So, while there isn't one single 'aha!' date for the chickenpox vaccine's development, its path from scientific concept to a recommended part of childhood health has been a steady progression, driven by a desire to protect children from a common, yet uncomfortable, illness.
