The World Health Organisation (WHO) defined “pharmacovigilance” as the science and activities relating to the detection, assessment, understanding and prevention of adverse effects or any other medicine/vaccine-related problem. This is even more important given the recent developments on the use of the various vaccines globally.
Initially, evidence of safety and efficacy is limited to the results from clinical trials, where patients are carefully selected and closely followed up under controlled conditions. For example, until today, children under the age of 16 are generally excluded. Tests are confined to a relatively small number of selected patients for a shorter period.
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