The standard three phase trials have been completed. Trials data have been published and are available to anyone. The vaccines are safe. Where does '4 years' come into it?
I am talking about phase 4, and this will last for years. This is the phase the scientists are now, checking the side effect of the vaccine. Phase 3 is good for the administration of the vaccine but vocid vaccine were made in rush which makes phase 4 to be the best. But, I can not even still use it, when no one in my whole state and neighboring stats are having the desease.
For that, you need the vaccine.
Let me quote some important content in a news for you.
Covid-19 vaccines: Why some African states can't use their vaccinesDespite many African countries struggling to obtain enough Covid-19 vaccines, some have thousands of expired doses which they have been unable to use.
Some countries are now destroying these vaccines, in line with the latest World Health Organization (WHO) advice.
Malawi has destroyed almost 20,000 doses of the AstraZeneca vaccine, while South Sudan has 59,000 doses which it also plans to discard. The vaccines had been donated through the African Union but had not been administered by their expiry date of 13 April.
The Democratic Republic of Congo, meanwhile, says it cannot use most of the 1.7 million AstraZeneca doses it received under the global Covax scheme for poorer countries. Only about 1,000 of the doses had been administered by the end of April. Most of this batch - with an expiry date of 24 June - is now being sent to other countries, with some already delivered to Ghana and Madagascar.
The South African government decided not to use them, concerned the vaccine offered insufficient protection from the variant prevalent in the country.
Nigeria, meanwhile, said it would be unable to use all the doses in time. So some were reassigned to neighbouring Togo and Ghana.
The WHO says only Togo and The Gambia have confirmed they used all these doses by the expiry date.
And information about what has happened to the rest is currently unavailable.
To read the news in full:
https://www.google.com/amp/s/www.bbc.com/news/56940657.ampI do not bother about the reason why people were not using it than maybe the complain from some people that have used it, such as blood clotting, and the new variant that might surfaced. Although, I may be wrong.