Why is there no report of Adverse Events of AstraZeneca Covid-19 Vaccines use in Nigeria/Africa?

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Ransom Baribefii Jacob

There has been reports of blood clot in people who took AstraZeneca vaccines around the world. With some countries halting its use. Nigeria/Africa is yet to report a single case of this adverse event. Are there scientific explanation for this?? Or there are no tools/platforms to track such events??

Rabab Ali

https://www.bbc.com/pidgin/tori-56398522

https://www.bbc.com/pidgin/tori-56417705

https://www.dw.com/en/african-countries-temporarily-suspend-astrazeneca-vaccine/a-56904649