The potential vaccines are in phase 3 of the clinical trials which is the last phase before the vaccine is deemed ready to be administered to the people infected with the virus. It appears to be that there will be more than one vaccine available some time towards the end of this year or at the beginning of next year.
How do we know what is the right vaccine for us? It's probably based on age, gender, ethnicity, pre-existing conditions, hospital and health insurance approval, location, cost, or what stage is the patient is in the infection, etc... Does everyone who is infected will receive a vaccine? They should receive the vaccine because the infection will continue to spread even though they don't show any symptoms.
Age is a factor. They will administer the drugs first to the older people or people who are in need of the vaccine because they are in the worst stage of the infection. Are covid babies able to receive vaccines also? Hopefully.
It may depend on the availability also. The hospital may only have one available type of vaccine to be administered to the patient even though other vaccines that weren't available due to shortage or the hospital never receiving them at the time are actually more effective. I could see the hospitals running out of supplies of vaccine especially when the vaccines becomes available for the first time. I heard that they are mass producing around 30 million vaccines.
There are more potential vaccines that they are working on at the moment however they had a late start and are still in clinical trials - phase 1 or 2. These vaccines are likely better and have less side effects but are people willing to wait longer for a better vaccine?