If you look at the graphs of any nation regarding 2nd doses there is a plateau of people that aren't getting it that stretches for months. Why wouldn't they want a second dose?
* If their reaction to the first dose was life-threatening due to anaphylaxis etc.
* If their reaction to the first dose was scary and/or long and they’re too scared to get the second dose.
* If they heard the first dose was highly effective on its own and don’t understand the risk around the long term efficacy.
* If they already had COVID (or just thought they did) and were treating the vaccine as a booster.
* If they had the first dose but their second dose was interdicted by misinformation.
* If they died or became incapacitated before getting their second dose.
* They did get a second dose but there are problems with the data collection.
* They had problems scheduling the second dose or couldn’t afford the risk of time off from work.
* They’re neglectful of their health.
Still, I wonder where we're going with the number of injections to be done. How many will we need in 2 to 3 years? 5 or 6? And what about people who are late on their jabs? This is gonna be some real mess. I guess the only way out is finding a functional cure for COVID.