The Omicron Covid variant has triggered a huge push for people to get their booster jabs as the government attempts to administer around one million doses per day.
Anxieties around Omicron have reached fever-pitch as people look to get a small taste of normality back and enjoy Christmas with loved ones after going without last year.
With all adults now eligible to book their booster, the rush is on. The government has even removed the 15-minute post-jab observation time to make the operation more efficient.
The army has also been mobilised in some areas to help administer jabs to as many people as quickly as possible.
Vulnerable people with weakened immune systems can also book a separate "third' jab", which is additional to the booster.
Various jabs work in different ways, but are based on the idea of building immunity by teaching the body to produce responsive proteins. So, does that mean that with it in your system you will test positive?
Do you test positive after you've had a booster jab?
No, the coronavirus booster jab will not make you test positive for the virus, because the jab doesn't use a live version of the virus. That means tests won't identify it.
Confusion surrounding this is understandable, with side effects of the jab often very similar to symptoms of the virus, like fatigue, aches, a headache, sore throat and fever.
Should you take a test if you experience symptoms?
Jabs can take a while to kick in, with protection potentially not fully kicking in until a week later. This means you can still catch and pass on the virus just as easily in the days following being jabbed as you could in the days before it.
This means that if your booster symptoms persist or in any way feel like they may not just be side effects you should take a test immediately.
The government website says: "If you feel very hot or cold and poorly for more than a few days and have other coronavirus symptoms stay at home. You should do a coronavirus test in case you already have coronavirus."
People who have had their boosters should still ensure they test regularly, and if you test positive it will not be due to the jab.
Boosters are important because jabs don't last in your body forever with their effectiveness fading over time. Therefore it is important you get your booster as quickly as possible to give yourself and others the most protection possible.
The booster is safe for all, although the government says you should contact your doctor prior to getting it if you were very unwell after the second jab.
