A 40-year-old man who took part in the 'Covishield' vaccine trial has alleged serious side effects, including a virtual neurological breakdown and impairment of cognitive functions and has sought Rs five crore compensation in a legal notice to Serum Institute and others, besides seeking a halt to the trial.

Alleging that the candidate vaccine was not safe, he has also sought cancelling approval for its testing, "manufacture and distribution", failing which legal action would be taken, reports our New Delhi correspondent.

The legal notice has been sent to Pune-based Serum Institute of India (SII), which has collaborated with Oxford University and AstraZeneca, a pharmaceutical company, in connection with making of the vaccine, ' Covishield'.

The Indian Council of Medical Research, one of the sponsors besides SII, and Sri Ramachandra Institute of Higher Education and Research, which administered the vaccine to the man, have been served with the notice.

The man, it alleged, suffered acute encephalopathy, damage or disease that affects the brain, following vaccination and all tests confirmed that the setback in his health was due to the test vaccine.

The trauma he underwent after taking it "clearly proves" that the vaccine was not safe as made out to be and all the stakeholders were trying to hide the adverse effect that the vaccine has had on him, the notice claimed.

A psychiatric evaluation revealed mild deficit in verbal and visual memory functions and an under functioning in overall cognitive functions, it said. "He has gone through extreme sufferings, both neurologically and psychologically. The vaccine had led to a virtual neurological breakdown in him."

The notice said it is impossible to "quantify monetarily, the sufferings, trauma, pain and humiliation (of hands, legs and body being tied and fastened firmly to the bed), which he and his family have undergone and are likely to undergo for a long time to come".

According to the legal notice, the information provided in the 'Participant Information Sheet (PIS)' was absolutely certain that 'Covishield', the vaccine developed by Oxford University, is safe and the man was led to believe it.

Hence, he decided to become a volunteer and signed the informed consent on September 29 and the test result for antibodies against coronavirus turned negative the same day.

On October 1, he was administered the vaccine.

Though there was no side effects for the first 10 days, he subsequently had episodes like severe headache and vomiting.

A doctor suggested investigations like a CT-scan as the man was oblivious of what was happening around him and could not respond to questions.

Detailing the sequence of events since October 11 when he was admitted to the Ramachandra Hospital and as narrated by the man's wife, the notice said he showed behavioural changes.

He could neither recognise anyone nor speak and was totally disoriented and was shifted to the ICU and was on October 26, "discharged at our (family's) request."

At home, he seemed quite disoriented at times and was unable to relate to things or work.

He would not have volunteered for the test vaccine if all the potential risk factors of the test vaccine had been known to him.

The legal notice has also been addressed to the Drugs Controller General of India; Professor Andrew Pollard, chief investigator, Oxford vaccine trial; The Jenner Institute Laboratories of the University of Oxford; and AstraZeneca UK.