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These volunteers are making short videos on TikTok and Instagram to explain their part in the vaccine effort.


Dr Monica Peres Oikeh

Dr Monica Peres Oikeh, is A General Practitioner currently working in cork, Republic of Ireland. She is a graduate of trinity college Dublin.  As a GP,  she looks after patients of all ages and genders. She is passionate about health promotion and uses social media- Tiktok and Instagram to deliver health tips.  She believes now more than ever, people should be able to access credible sources of information regarding their health. She is also working with the Department of Health in the Republic of Ireland to facilitate this and is one of the doctors administering the Covid19 vaccines in vaccination hub.

Monica is Nigerian Irish. Pre-pandemic her favourite thing to do was to hop on the plane and explore a new country ( 5 continents and counting), but she has recently got a lovely dog called Maya and now loves to spend time with her instead. She also loves cooking, learning new languages and spending time with family.


Dr Walid Zaher

Dr Walid Zaher is the Study Director of 4Humanity clinical trials and Chief Research Director G42 Healthcare. As study director of #4Humanity, the world’s first phase III clinical trials of inactivated vaccine for COVID-19, Dr Walid has a unique vantage point from where he will be sharing his personal experiences and updates to keep the world informed on developments from the UAE and partnering trials nations; Bahrain, Jordan and Egypt.

Dr Walid is also an adjunct Associate professor at the College of Medicine and Health Sciences at United Arab Emirates University, with more than 30 ISI publications in reputed journals including Nature and Stem Cells. Dr Walid’s previous posts include Corporate Group Clinical Research & Innovation Director at Abu Dhabi Health Services Company (SEHA). He was also the General Director of the College of Medicine Research centers at King Saud University (Riyadh, Saudi Arabia), a consultant for the Saudi 2020 national biotechnology and infectious disease plan, and an assistant professor of regenerative medicine and stem cells. 

Dr Walid graduated with MBBS from Saudi Arabia with a residency training in Obstetrics and Gynaecology, followed by Master degrees in Medical education, Anatomy, Embryology and Bioscience technology. He holds a PhD in regenerative Medicine from Denmark, and has 1.5 yrs of laser-medicine training attachment at Harvard-MGH (Boston-USA). He has been a recipient of prestigious awards such as the King Saud University Research Prize Award for Outstanding research, King Saud University, Riyadh, KSA (2017).


Dr Chintal Patel

Dr Chintal Patel is an NHS General Practitioner (GP) working on the front line, caring for patients in London.  She completed a degree in Immunology and cell pathology before completing her medical degree at University College London in 2002. She is a trainer for Imperial College. She has a special interest in women and children’s health, lifestyle medicine and nutrition and writes content for various publications around these topics.

In her spare time, Chintal volunteers at London’s large vaccination centres. She also works with NHS England to help share information on mainstream media about the pandemic and the vaccine, reaching out to ethnic minority groups in particular.  She uses her knowledge of Immunology to break down information into digestible chunks for everyone to understand and uses her love of food and cooking to help share her health messages.

Outside of work, Chintal is keen cook and writes a cookery blog www.drchintalskitchen.com.  She loves celebrating food from all around the world and in particular, with her Indian Heritage, making Indian food and recipes accessible to all.  She lives in London with her husband and two children who can often be found cooking up a storm with her.  She is a keen skier and loves to travel, but now that the pandemic has restricted her globetrotting, she has found a new interest and love for gardening and growing her own produce.


Dr Mohan Sekeram

Dr Mohan Sekeram is a Nhs General Practioner in Merton, Southwest London. He is currently a regional lead for Personalised Care supporting individuals make decisions around what matters to them. This has been invaluable during current times in addressing concerns of our community. 

Mohan has been involved in the vaccination roll in his local borough and in particular coordinating the volunteers. He has worked regularly in the vaccination hubs and involved in many webinars educating local community around vaccine facts. Mohan has also co-ordinated community outreach clinics to increase uptake. 

Mohan loves spending time with his family and enjoys many sports. He is a keen runner and support AFC Wimbledon.


Leticia Monin

Leticia Monin is a Postdoctoral Research Fellow at the Francis Crick Institute, in London. Her research focuses on the development of the immune system and immune mechanisms controlling diseases (including Covid-19) at mucosal sites. Leticia is originally from Uruguay, where she studied for her BSc in Biochemistry and her MSc in Molecular and Cell Biology. She then moved to the University of Pittsburgh, USA, where she received her PhD in Immunology.  

At the onset of the pandemic, Leticia and many of her colleagues reoriented their work to contribute to the understanding of Covid-19. Specifically, she has been involved in studies geared at understanding the differences in the immune response in people affected with severe vs. mild/asymptomatic Covid-19. More recently, she has participated in studies to characterise the response to both infection and SARS-CoV-2 vaccination in cancer patients.

Leticia loves the outdoors and being active (particularly HIIT and yoga). She is also an avid reader and has a strange fascination with horror films. She is fluent in English, Spanish, French, Italian and Catalan.


Dr Kiran Morjaria

Dr Kiran Morjaria is a junior doctor and comedian based in Manchester. He is working on the front line admitting and treating patients with Covid-19. In his spare time he volunteers at a Covid-19 vaccination hub as a vaccinator.

Kiran graduated from Leeds Medical School in 2017, where he was awarded the SPARK scholarship for enterprise, and is currently training to be a GP. He has performed comedy across the national circuit and continues to make medicine accessible and fun online.

Kiran’s big passion outside of medicine is comedy. He also enjoys staying active, he is a keen gym-goer, tennis player and vegetarian foodie.


Dineo Thaele & Matshidiso Sello

Dineo and Matshidiso are demographers working at Wits Vaccines Infectious Disease Analytics (VIDA) Research unit in South Africa. They are screening and testing for Covid-19 in the township of Soweto and informal settlements in Thembelihle as part of a wider child health programme. They are assessing the impact of Covid-19 on community access to healthcare, livelihoods and education. Information that may help ensure distribution of a vaccine is as effective as possible. 


Dr Natalia Pasternak

Natalia is a microbiologist specialising in molecular genetics of bacteria. She currently works as a visiting researcher at the University of Sao Paolo, at the Vaccine Development Laboratory. She is the Director-President of the Instituto Questão de Ciência (“a question of science”) and an outspoken advocate for scientific thought in public life. She is a columnist for the newspaper “O Globo” and is a regular media commentator on Covid-19 in Brazil.



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You can help too

Thousands of volunteers around the world are signing up to help trial these vaccines to make sure they’re safe and effective.

Find a trial near you


Team Halo is an effort to support and celebrate the inspiring collaboration between scientists all over the world to help us end this pandemic with safe and effective vaccines.

The ‘halo’ represents the ring of connected science that circles the globe.

All participation is voluntary. If you’re involved in the vaccine search and would like to be listed on this site, please get in touch.

Team Halo was established as part of the United Nations Verified Initiative in partnership with The Vaccine Confidence Project at the University of London’s School of Hygiene and Tropical Medicine. It is proud to collaborate with the Vaccine Alliance and GAVI. Support is provided by Luminate and IKEA Foundation.