covid 19 vaccine trial in south africa
Covid-19 vaccine trial to start in South Africa. Photo: SAGovNews

The first participants in South Africa’s first clinical trial for a vaccine against COVID-19 will be vaccinated this week.

The first clinical trial in South Africa and on the continent for a COVID-19 vaccine was announced on Tuesday during a virtual press conference hosted by the University of the Witwatersrand, Johannesburg (Wits).

Wits University is collaborating with the University of Oxford and the Oxford Jenner Institute on the South African trial.

The South African Ox1Cov-19 Vaccine VIDA-Trial aims to find a vaccine that will prevent infection by SARS-CoV-2, the virus that causes COVID-19.

In South Africa, over 100 000 people have been diagnosed with COVID-19 since March when President Cyril Ramaphosa declared a national state of disaster and lockdown.

By 17 June 2020, South Africa contributed to 30% of all diagnosed COVID-19 cases and 23% of all COVID-19 deaths on the African continent. These statistics emphasise the urgent need for prevention of COVID-19 on the continent.

Shabir Madhi, Professor of Vaccinology at Wits University and Director of the South Africa Medical Research Council (SAMRC) Vaccines and Infectious Diseases Analytics Research Unit (VIDA), leads the South African Ox1Cov-19 Vaccine VIDA-Trial.

“This is a landmark moment for South Africa and Africa at this stage of the COVID-19 pandemic. As we enter winter in South Africa and pressure increases on public hospitals, now more than ever we need a vaccine to prevent infection by COVID-19,” said Madhi, speaking at the launch of the South African Ox1Cov-19 Vaccine VIDA-Trial, which is being run at multiple sites in South Africa.

“We began screening participants for the South African Oxford 1 COVID-19 vaccine trial last week and the first participants will be vaccinated this week,” says Madhi.

Professor Zeblon Vilakazi, Vice Principal and Deputy Vice Chancellor: Research and Postgraduate Affairs at the Wits University, who facilitated the virtual press conference, said vaccines are among the most powerful tools to mitigate life-threatening diseases.

“Without a vaccine against COVID-19, there will likely be ongoing contagion, causing severe illness and death. Wits is committed to developing a vaccine to save lives in collaboration with the University of Oxford.”

Prior to launch, the South African study was subject to rigorous review and has been approved by the South African Health Products Regulatory Authority (SAHPRA) and the Human Research Ethics Committee of the University of the Witwatersrand.

Furthermore, after eliciting and considering public comment, the Department of Agriculture, Forestry and Fisheries approved import of the investigational vaccine for use in the trial.

Dr Sandile Buthelezi, Director General at the Department of Health, said the SA government is excited at the launch of the vaccine trial, which will go a long way to cement South Africa’s leadership in the scientific space.

“With COVID-19 infections increasing every day, the development of the vaccine will be the last solution in the long term, and we are fully behind the team leading this trial,” said Buthelezi.

SA’s participation in international trials

The vaccine is being evaluated in a large clinical trial in the UK where more than 4 000 participants have already been enrolled.

In addition to the South African study, similar and related studies are about to start in Brazil. An even larger study of the same vaccine of up to 30 000 participants is planned in the USA.

Professor Helen Rees, Chair of SAHPRA and Executive Director of the Wits Reproductive Health and HIV Institute (Wits RHI), said it is essential that vaccine studies are performed in southern hemisphere countries, including in the African region, concurrently with studies in northern hemisphere countries.

“This allows evaluation of the efficacy and safety of candidate vaccines to be assessed in a global context, failing which the introduction of many life-saving vaccines into public immunization programmes for low-middle income countries frequently lags behind those in high-income countries,” said Rees.

Rees also co-directs the Wits African Leadership in Vaccinology Excellence (ALIVE) flagship programme and is engaged in global discussions with Gavi, the Vaccine Alliance and the World Health Organisation to ensure equitable access for all countries, including those in Africa, should a successful vaccine be developed.

About the SA vaccine on trial

The technical name of the vaccine is ChAdOx1 nCoV-19, as it is made from a virus called ChAdOx1, which is a weakened and non-replicating version of a common cold virus (adenovirus). The vaccine has been engineered to express the SARS-CoV-2 spike protein.

The vaccine being used in the South African trial is the same as that being used in the UK and Brazil.

The vaccine was made by adding genetic material – called spike glycoprotein – that is expressed on the surface of SARS-CoV-2 to the ChAdOx1 virus.

This spike glycoprotein is usually found on the surface of the novel Coronavirus and is what gives the Coronavirus its distinct spiky appearance.

These spikes play an essential role in laying a path for infection by the Coronavirus. The virus that causes COVID-19 uses this spike protein to bind to ACE2 receptors on human cells.

ACE2 is a protein on the surface of many cell types. It is an enzyme that generates small proteins that then go on to regulate functions in the cell. In this way, the virus gains entry to the cells in the human body and causes COVID-19 infection.

Researchers have shown that antibodies produced against sections of the spike protein after natural infection are able to neutralize (kill) the virus when tested in the laboratory.

By vaccinating volunteers with ChAdOx1 nCoV-19, scientists hope to make the human body recognise and develop an immune response (develop antibodies) to the spike glycoprotein that will help stop the SARS-CoV-2 virus from entering human cells and causing Covid-19.

Local application of a global response

In addition to the more than 4 000 people already vaccinated in the UK with the ChAdOx1 nCoV-19 vaccine, other vaccines made from the ChAdOx1 virus have also been given to more than 320 people to date.

These vaccines have been shown to be safe and well-tolerated, although they can cause temporary side effects, such as a temperature, headache or a sore arm.

There are currently over 100 candidate COVID vaccines in development around the world and many of South Africa’s best vaccine research institutions will soon be involved in a range of vaccine studies evaluating other types of potential COVID vaccines.

“As the world rallies to find health solutions, a South African endeavour for the development of an effective COVID-19 vaccine is testament to our commitment of supporting healthcare innovation to save lives,” said Professor Glenda Gray, President and CEO of the South African Medical Research Council. –