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New Delhi, Jul 6: The Indian Academy of Sciences, a Bengaluru-based body of scientists, has said the Indian Council for Medical Research's (ICMR) target to launch a coronavirus vaccine by August 15 is "unfeasible" and "unrealistic".

The IASc said while there is an unquestioned urgent need, vaccine development for use in humans requires scientifically executed clinical trials in a phased manner.

While administrative approvals can be expedited, the "scientific processes of experimentation and data collection have a natural time span that cannot be hastened without compromising standards of scientific rigour", the IASc said in a statement.

In its statement, the IASc referred to the ICMR's letter which states that "it is envisaged to launch the vaccine for public health use latest by 15th August 2020 after completion of all clinical trials".

The ICMR and Bharat Biotech India Limited, a private pharmaceutical company, are jointly developing the vaccine against the novel coronavirus -- SARS-CoV-2.

The IASc welcomes the exciting development of a candidate vaccine and wishes that the vaccine is quickly made available for public use, the statement said.

"However, as a body of scientists including many who are engaged in vaccine development IASc strongly believes that the announced timeline is unfeasible. This timeline has raised unrealistic hope and expectations in the minds of our citizens," it said.

Aiming to launch an indigenous COVID-19 vaccine by August 15, the ICMR had written to select medical institutions and hospitals to fast-track clinical trial approvals for the vaccine candidate, COVAXIN.

Experts have also cautioned against rushing the process for developing a COVID-19 vaccine and stressed that it is not in accordance with the globally accepted norms to fast-track vaccine development for diseases of pandemic potential.

The IASc said trials for a vaccine involve evaluation of safety (Phase 1 trial), efficacy and side effects at different dose levels (Phase 2 trial), and confirmation of safety and efficacy in thousands of healthy people (Phase 3 trial) before its release for public use.

Clinical trials for a candidate vaccine require participation of healthy human volunteers. Therefore, many ethical and regulatory approvals need to be obtained prior to the initiation of the trials, it added.

The IASc said the immune responses usually take several weeks to develop and relevant data should not be collected earlier.

"Moreover, data collected in one phase must be adequately analysed before the next phase can be initiated. If the data of any phase are unacceptable then the clinical trial is required to be immediately aborted," it said.

For example, if the data collected from Phase 1 of the clinical trial show that the vaccine is not adequately safe, then Phase 2 cannot be initiated and the candidate vaccine must be discarded.

For these reasons, the Indian Academy of Sciences believes that the announced timeline is "unreasonable and without precedent", the statement said.

"The Academy strongly believes that any hasty solution that may compromise rigorous scientific processes and standards will likely have long-term adverse impacts of unforeseen magnitude on citizens of India," it said.

New Delhi, Apr 24: The Central government said on Wednesday that the number of COVID-19 cases in the country is now doubling in every 10 days, adding that had the lockdown not been imposed on time, the number of cases would have sky-rocketed to over one lakh by now.

"Had we not taken the decision to impose nationwide lockdown, we would have had around one lakh COVID-19 cases by now. This is a reasonable estimate," said Niti Aayog member V.K. Paul.

Paul, who is also the Chairman of the government's Empowered Committee- 1, said the "cases are now doubling in every 10 days."

"As on March 21, our doubling time of cases was three days. Results started showing on March 23, due to travel restrictions imposed earlier. On April 6, further slowing of doubling rate became visible, thanks to the nationwide lockdown," he added.

He further added that the decision to impose the lockdown was timely and asserted that the curve has begun to flatten.

"Nationwide lockdown helped take us away from the exponential growth curve and thereby contain the growth of COVID-19 cases," he said.

Paul further added that surveillance has been a great strength in containing the spread of the virus.

"Besides containing the spread, augmenting testing and improving preparedness, the nation has brought about a massive behavioural change through a ‘Jan Andolan' (mass movement)," he said.

Meanwhile, the number of confirmed cases in the country has crossed the 23,000-mark, with 718 deaths. Globally, the number of cases has crossed 2.7 million while the death toll has mounted to 1.9 lakh.