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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, Jun 24: A litre of diesel on Wednesday was more expensive than a litre of petrol after the price of the former was hiked by 48 paise on the 18th successive day of fuel price revisions. While petrol price remained unchanged for the first time since June 7, diesel prices maintained upward trajectory to touch new highs.

It is for the first time in Delhi that diesel has become more expensive than petrol. A litre of the fuel now costs ₹79.88 as against ₹79.76 for a litre of petrol, as per a report in news agency ANI.

While surging fuel prices may generate much-needed revenue for governments, it would also have a detrimental impact on household budgets. The spike in diesel prices also has a wider impact on the transport and agricultural sectors which are largely dependent on the fuel.

The widest gap between the prices of the two fuels was on June 18 of 2012 when a litre of petrol was at ₹71.16 in Delhi while diesel was at ₹40.91. On June 28, the gap between the two fuels was 31.17 per litre in Mumbai. Around that time, there was a spurt in sales of diesel passenger vehicles while demand for such vehicles has come down significantly in current times. This has also led many manufacturers to ditch diesel engines completely.

The current trend of fuel price hikes are unlikely to do demand for petrol vehicles much good either.

Daily price revisions of the two fuel had been temporarily halted for 83 days till it was resumed on June 7.

India's demand for fuel doubled in May and has been steadily rising in June with the easing of restrictions. Indian refineries have already scaled up crude processing with Indian Oil Corp, the country's top refiner, looking to operate its plants at about 90% capacity in June.

The rising fuel prices, however, have resulted in political uproar with Congress leading the charge against the central government and accusing it of penalising consumers by imposing high taxes. A demand for including fuel prices under Goods and Services Tax (GST) has also been renewed by many but it is highly unlikely that it would happen. With oil companies looking to cut back on their previous loses and governments - central as well as states - aiming to generate revenue after tumultous weeks of lockdown, fuel price hikes are likely to stay till at least the end of June.