Follow these scientists working to get us safe and effective Covid vaccines. Ask them anything.

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Featured Guides

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


Purvi Parikh

Purvi Parikh, MD, FACP, FACAAI is an adult and pediatric allergist and immunologist at allergy and asthma associates of Murray Hill in New York City. She is currently on faculty as Clinical Assistant Professor in both departments of Medicine and Pediatrics at New York University School of Medicine. She is an avid vaccine champion with the UN Foundation’s vaccine program Shot@life, and currently one the investigators for the covid 19 vaccine trials at the NYU Vaccine Center.  She is highly passionate in health policy and travels to Washington, D.C. multiple times per year to speak with legislators to influence health policy.


Sean Elias

Sean Elias, 33 years old and originally from Cardiff, is a post-doctoral immunologist and  ‘Public Engagement with Research’ (PER) leader based at the Jenner Institute, University of Oxford. Currently he is working as part of the Covid-19 vaccine trial team both in the lab and as part of the SciComms team. Sean has a keen interest in the human immune system with previous work on T cells, B cells and antibodies for various diseases including Malaria, Ebolavirus, Salmonella and now Covid-19. On the SciComms front, Sean has a keen interest in developing educational materials for schools and the general public, in particular through the medium of board games. During the pandemic he has also provided photos, videos, explainers and most recently GIFS to the world’s media on behalf of the Covid-19 vaccine research team. 

Outside of work, Sean is a keen triathlete, cricketer & football player, avid board gamer and lover of ALL things Star Wars.


Jaqueline Goes de Jesus

Jaqueline Goes de Jesus is a biomedical scientist, in charge of the genetic sequencing of the new coronavirus in the first cases of Covid-19 in Latin America. She is currently working as a fellow at The São Paulo Research Foundation (FAPESP), as part of her post-doctorate at the São Paulo Institute of Tropical Medicine – University of São Paulo (IMT-USP), within the Brazil-UK Centre for Arbovirus Discovery, Diagnosis, Genomics and Epidemiology (CADDE). Jaqueline also carries out research in the field of the following emerging arboviruses: ZIKV, DENV, CHIKV, YFV, ORV and MAYV.


Dr Soha Albayat

Dr. Soha Albayat is Head of Vaccination at Qatar’s Ministry of Public Health, and national lead for the Covid-19 track and trace team. Soha is also on the vaccination planning committee and regularly follows up with covid-19 vaccine developers and manufacturers to stay updated on the progress of trials.


André Báfica

André Báfica is a researcher coordinating Rede IMUNOVIDa, a network aimed at promoting new strategies for the development of a Covid-19 vaccine. André is an Associate Professor of Immunology at Federal University of Santa Catarina and Director for the South Region of the Brazilian Society for Immunology, where he carries out several innovative projects and runs a research group focused on understanding the mechanisms involved in the pathogenesis of diseases, such as tuberculosis. André has a PhD in Human Pathology from Fundação Oswaldo Cruz (CPqGM) and a post-doctorate in Immunology from the National Institutes of Health, USA.


Nathan Peiffer Smadja

Nathan Peiffer-Smadja is a physician specialised in Internal Medicine and Infectious Diseases, a fellow of the French Society of Infectious Diseases, a PhD candidate in Public Health and a Honorary Clinical Research Fellow at Imperial College London. He is currently living in France and has worked on the Covid-19 Vaccine for over 6 months.


Samantha Vanderslott

Samantha Vanderslott is a health sociologist based in the Oxford Vaccine Group, at the University of Oxford, UK. She has worked there for the past four years following her PhD in Science and Technology Studies at University College London. Her research mainly uses qualitative methods and concentrates on health, society, and policy topics. She is particularly interested in public attitudes to vaccination, for routine vaccines and during outbreaks, as well as vaccine policies, in how these differ across countries and time. Since the COVID-19 pandemic began she has been researching views about potential vaccines and the increase in misinformation and disinformation.


Natali Serafin

Natali Serafin a research scientist working at the Vaccine and Infectious Disease Analytics (VIDA) research unit in South Africa. Natali’s expertise includes project management, epidemiology, and clinical medicine. She is currently managing a sentinel Covid-19 surveillance taking place at Chris Hani Baragwanath Academic Hospital in Soweto.



Follow the people working on all aspects of science that will make these coronavirus vaccines safe and effective


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Antoine Flahault


Dr. Angela Rasmussen


Karnyart K Samnuan


Jyotiranjan Sahoo


British Society for Immunology


Prof Katie Ewer


Dr E Venkata Rao


Melvin George


Michel Kazatchkine


Otavio Ranzani


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 in partnership with the The Vaccine Confidence Project at the University of London’s school of Hygiene and Tropical Medicine. It is proud to collaborate with the UN Verified Initiative and Gavi, the Vaccine Alliance. Support is provided by Luminate, IKEA Foundation and the Global Challenges Foundation.