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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 one the investigators for the Covid-19 vaccine trials at the New York University Vaccine Center.

Purvi is an adult and paediatric allergist and immunologist at Allergy and Asthma Associates of Murray Hill and is currently on faculty as Clinical Assistant Professor in both departments of Medicine and Paediatrics at New York University School of Medicine.

She is an avid vaccine champion with the UN Foundation’s vaccine program Shot@life.  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.


Professor Shiv Pillai

Shiv is Professor of Medicine and Health Sciences & Technology at Harvard Medical School where he’s Director of the immunology postgraduate programmes, and a Group leader at the Ragon Institute of MGH, MIT and Harvard, where his lab is located. He is a world leader in the study of fundamental B-cell development. Currently his lab is studying the immune response to Covid-19, where they have identified a potential way in which the disease’s cytokine storm may inhibit development of a strong antibody response by the immune system.


Samantha Vanderslott

Samantha Vanderslott is 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.

Samantha 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.


Dr Tasnim Jara

Dr Tasnim Jara works as an A&E doctor in the NHS and studies evidence-based health care at the University of Oxford. As a frontline clinician, Tasnim regularly supports her patients to make evidence-based decisions about COVID-19 vaccines. Alongside fighting the pandemic, Tasnim makes short videos in Bangla to tackle covid and vaccine related misinformation. So far, her health awareness videos have been viewed for more than 280 million minutes and she has gained more than 1.5 million followers on Facebook and YouTube. Tasnim also made strategic partnerships with media, business, NGO, faith leaders, and government institutions to further broaden reach. The Business Standard named her one of 7 changemakers of 2020.

Tasnim has co founded a health-tech startup called Shohay with the aim to disseminate reliable healthcare information in Bangla.


Rômulo Neris

Rômulo is a Biophysicist and PhD student in Immunology and Infection at the Federal University of Rio de Janeiro. He was studying at the University of Califorina-Davis in the USA before returning to Brazil during the pandemic to help with research on the new coronavirus. His work focuses on understanding the mechanisms that make our bodies develop immunity against Sars-CoV-2 and the reasons why some people develop severe illness while others experience mild symptoms.


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.


Jeanine du Plessis

Jeanine du Plessis is a medical scientist working at the Vaccine and Infectious Disease Analytics (VIDA) research unit in South Africa. Currently she is working on multiple Covid-19 related studies including sentinel hospital surveillance, adult and paediatric Covid-19 associated mortality study and the Oxford vaccine trial – ChadOx-1. She has laboratory experience in forensic toxicology, microbiology and molecular biology.


Dr Brooke Vandermolen

Dr Brooke Vandermolen is a practicing Obstetrics & Gynaecology registrar doctor, who has worked and trained in a variety of London NHS hospitals. Brooke is experienced at dealing with all aspects of women’s health and pregnancy. Brooke created her educational platform “The OBGYN mum” via which she shares insights and tips around pregnancy, fertility, menopause and more through social media and blog posts. She is an experienced medical writer, and creates digital content for the The Royal College of Obstetricians and Gynaecologists (RCOG) and NHS England to translate trending topics into evidence-based, relatable bite-sized media. She also promotes information about the COVID-19 vaccine in pregnancy and its impact on fertility to tackle the misinformation. 

Brooke is mum to 2 preschoolers who keep her very busy but whenever she gets a spare second she loves spinning and yoga and has developed a recent passion for interior decorating! 



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


Ragon Institute


The Vaccine Confidence Project


Prativa Majee


Otavio Ranzani


Jason Kindrachuk


Samantha Vanderslott


Chinthaparthi Prabhakar Reddy


Sheuli Porkess


Jyotiranjan Sahoo


Gayatree Mishra


Prof. Akiko Iwasaki


Heidi Larson


Dr Tim Mastro


Mariet Feltkamp


Robin Shattock


Abraham Flaxman


Sandeep Panigrahi


Dr. Angela Rasmussen


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.