April 19, 2017

Phase I clinical trial of Zika vaccine to begin next month



Tests, which involve 48 adults, will be randomised and placebo-controlled
Bharat Biotech International Ltd in Hyderabad will start the Phase I clinical trial of Zika virus
vaccine (MR 766) in two centres in India next month.

“We have already got the approval from DCGI [Drug Controller General of India] in March
to carry out the Phase I clinical trial,” says Dr. Krishna Ella, Chairman and Managing
Director of Bharat Biotech.

Dose ranges
It will be a randomised, placebo-controlled, double-blind trial involving 48 adults, both men
and women (who are not pregnant). Each volunteer will receive two vaccine doses on days 0
[the starting day] and 30 and will be followed-up for a year for both safety and immune
response. Three different dose ranges will be tested.

There will be three arms in the trial, and each one will recieve one of the three different dose
ranges.

The Phase I is being initiated based on the promising results in animals trials. In the animal
trials, two doses of the vaccine made using an African Zika virus strain conferred 100%
protection against mortality and disease in mice. The protection was the same when the mice
were infected with an Asian and an African Zika strains.

While the viral load was “undetectable” in the case of vaccinated mice, the amount of virus in
unvaccinated mice shot up four days after being infected.

Source : The Hindu

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