The word jab is standard UK English for 'shot'. It might be slightly informal, but it's definitely standard to see it in the news and in government publications

The word jab is standard UK English for 'shot'. It might be slightly informal, but it's definitely standard to see it in the news and in government publications. Example: https://www.bbc.co.uk/news/health-54337585 https://www.bbc.co.uk/news/health-54337585