![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/PLAFO2ZJWUMWAIVEXZQHEB42QM.jpg?smart=true&auth=08a8114a160382ef8048a4888badbce45504517d370f16608d7ff62c36eb0294&width=400&height=225)
Police stand by as people wearing face masks queue to get access to the vaccination center at the 'Arena' in Berlin's Treptow district in Germany. AFP
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ROAB5JNZQO5N7D6GIME5YL4VLQ.jpg?smart=true&auth=c9c00769389ec1610a32faa4704e9ff17aceb1708cb2ca4b7855653b3f3b522a&width=400&height=225)
A nurse prepares a dose of the Pfizer-BioNTech vaccine at the Croix Rousse Hospital in Lyon, France. AFP
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/7HYTYHWQCA43QPIKGLLGTVTV6M.jpg?smart=true&auth=0a6e06dd089449b3ba7a6577ef3c1d3053f6cc95d5f056300ab6e03e26f13fa0&width=400&height=225)
Health workers wait to be vaccinated against the coronavirus, in Pamplona, northern Spain. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ZUWZVC7JJB4Y2DPVO7XFY5S3RY.jpg?smart=true&auth=d7c12fe76b8361d8aafb6208e53fcf5c8af317dca302965c15e8f360d93e8c6e&width=400&height=225)
A doctor checks an elderly woman before he injected her with the Pfizer-BioNTech vaccine at the vaccination center at the Metropolis-Halle events center in Potsdam, Germany. EPA
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/M5OZ3OAVNLK4RS6V4XORTKXFRI.jpg?smart=true&auth=48928c86b0eb320eede4836302b8e60b701873bd828d258308fa1831339f3acc&width=400&height=225)
People queue for a Covid-19 vaccination at a vaccination hub at Guys Hospital in London, England. Getty Images
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/QU3WICTQ6LXDIUQYP6RALBU3VY.jpg?smart=true&auth=397d75b63adbe937ed35b73774570272b142a153e954bd2434227397cf5f8e88&width=400&height=225)
Mr. Stuessi receives a vaccine as his wife sits beside at the vaccination reference center at the Epidemiology, Biostatistics and Prevention Institute in Zurich, Switzerland. Reuters
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/56WHUOM2TG5IM7GO7ICBT4OJ34.jpg?smart=true&auth=f9dedd46ee851bb7252fd8fd8bc887cecc44e9b8864210618a2e7cc307136bfd&width=400&height=225)
A healthcare worker prepares a syringe with a dose of the Pfizer-BioNTech vaccine at the Villa Scassi Hospital in Genoa, Italy. EPA
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ZHNMBQZF7HXTEC6W2JNG4T2YPI.jpg?smart=true&auth=37ded9e2a2b230e65fe041ff22990579d4bcdeaebcce359f8ecebe038c971781&width=400&height=225)
Nursing home workers wait their turn to be vaccinated with Pfizer-Biontech COVID-19 vaccines at the Ange-Raymond Gilles care home in Jemeppe-sur-Meuse, near Liege, Belgium. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/57JT37XONIKKCVUBG6YZ3EXNS4.jpg?smart=true&auth=f023d0a9caaf6e74bca9f461d14d17d2721613427b34b89ce2bd2b90efeea469&width=400&height=225)
Netherlands' Health Minister Hugo de Jonge applauds after healthcare worker Sanna Elkadiri, second right, received the first shot of the Pfizer-BioNTech coronavirus vaccine at a mass vaccination center in Veghel, Netherlands. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/7UKG2LDXLFAR4WW3JIAHFPFGDY.jpg?smart=true&auth=93f8b9a9ac091b4d769251b464539ee123c428b464218e2da5cb93bcbe0020cf&width=400&height=225)
A vaccination centre in the terminal of Rostock-Laage Airport in Large, Germany. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/PLAFO2ZJWUMWAIVEXZQHEB42QM.jpg?smart=true&auth=08a8114a160382ef8048a4888badbce45504517d370f16608d7ff62c36eb0294&width=400&height=225)
Police stand by as people wearing face masks queue to get access to the vaccination center at the 'Arena' in Berlin's Treptow district in Germany. AFP
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ROAB5JNZQO5N7D6GIME5YL4VLQ.jpg?smart=true&auth=c9c00769389ec1610a32faa4704e9ff17aceb1708cb2ca4b7855653b3f3b522a&width=400&height=225)
A nurse prepares a dose of the Pfizer-BioNTech vaccine at the Croix Rousse Hospital in Lyon, France. AFP
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/7HYTYHWQCA43QPIKGLLGTVTV6M.jpg?smart=true&auth=0a6e06dd089449b3ba7a6577ef3c1d3053f6cc95d5f056300ab6e03e26f13fa0&width=400&height=225)
Health workers wait to be vaccinated against the coronavirus, in Pamplona, northern Spain. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ZUWZVC7JJB4Y2DPVO7XFY5S3RY.jpg?smart=true&auth=d7c12fe76b8361d8aafb6208e53fcf5c8af317dca302965c15e8f360d93e8c6e&width=400&height=225)
A doctor checks an elderly woman before he injected her with the Pfizer-BioNTech vaccine at the vaccination center at the Metropolis-Halle events center in Potsdam, Germany. EPA
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/M5OZ3OAVNLK4RS6V4XORTKXFRI.jpg?smart=true&auth=48928c86b0eb320eede4836302b8e60b701873bd828d258308fa1831339f3acc&width=400&height=225)
People queue for a Covid-19 vaccination at a vaccination hub at Guys Hospital in London, England. Getty Images
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/QU3WICTQ6LXDIUQYP6RALBU3VY.jpg?smart=true&auth=397d75b63adbe937ed35b73774570272b142a153e954bd2434227397cf5f8e88&width=400&height=225)
Mr. Stuessi receives a vaccine as his wife sits beside at the vaccination reference center at the Epidemiology, Biostatistics and Prevention Institute in Zurich, Switzerland. Reuters
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/56WHUOM2TG5IM7GO7ICBT4OJ34.jpg?smart=true&auth=f9dedd46ee851bb7252fd8fd8bc887cecc44e9b8864210618a2e7cc307136bfd&width=400&height=225)
A healthcare worker prepares a syringe with a dose of the Pfizer-BioNTech vaccine at the Villa Scassi Hospital in Genoa, Italy. EPA
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/ZHNMBQZF7HXTEC6W2JNG4T2YPI.jpg?smart=true&auth=37ded9e2a2b230e65fe041ff22990579d4bcdeaebcce359f8ecebe038c971781&width=400&height=225)
Nursing home workers wait their turn to be vaccinated with Pfizer-Biontech COVID-19 vaccines at the Ange-Raymond Gilles care home in Jemeppe-sur-Meuse, near Liege, Belgium. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/57JT37XONIKKCVUBG6YZ3EXNS4.jpg?smart=true&auth=f023d0a9caaf6e74bca9f461d14d17d2721613427b34b89ce2bd2b90efeea469&width=400&height=225)
Netherlands' Health Minister Hugo de Jonge applauds after healthcare worker Sanna Elkadiri, second right, received the first shot of the Pfizer-BioNTech coronavirus vaccine at a mass vaccination center in Veghel, Netherlands. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/7UKG2LDXLFAR4WW3JIAHFPFGDY.jpg?smart=true&auth=93f8b9a9ac091b4d769251b464539ee123c428b464218e2da5cb93bcbe0020cf&width=400&height=225)
A vaccination centre in the terminal of Rostock-Laage Airport in Large, Germany. AP Photo
![](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/PLAFO2ZJWUMWAIVEXZQHEB42QM.jpg?smart=true&auth=08a8114a160382ef8048a4888badbce45504517d370f16608d7ff62c36eb0294&width=400&height=225)
Police stand by as people wearing face masks queue to get access to the vaccination center at the 'Arena' in Berlin's Treptow district in Germany. AFP
No long-term risk from mixing Covid-19 vaccines, scientists say
Taking one type of vaccine now and another in a year is widely thought to be safe and could even offer better protection
![Daniel Bardsley](https://thenational-the-national-prod.cdn.arcpublishing.com/resizer/v2/https%3A%2F%2Fs3.amazonaws.com%2Farc-authors%2Fthenational%2F4dcffed7-67d1-4c6f-b468-84a82d1ddd22.png?smart=true&auth=e4d7a6e3c76d7ec922e25339bc18538c62bc925936c2316006dc89b8a7becdc6&width=70&height=70)
Daniel Bardsley
20 January, 2021
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