A 40-year-old volunteer who took part in the 'Covidshield' vaccine trial in Chennai has alleged serious side effects, including a virtual neurological breakdown and impairment of cognitive functions and has sought a compensation of Rs 5 crore from Serum Institute of India and others, besides demanding that the trial be halted. Alleging that the vaccine candidate was not safe, he has also sought for the cancellation of the vaccine’s “manufacture and distribution”.