What side effects? We've already agreed that summoning alien invasions is unlikely, so what are you concerned by?There are already several effective vaccines in scale up manufacturing. The problem is the side affects. Adverse reactions (not side effects) have been very low during the trials. There is no reason to vaccinate under 50s. The vaccine side effects are likely to cause problems for those most likely to need it.
I didn't think any of the Vaccine candidates had passed the phase 3 trials yet. Those are the ones that demonstrate effectiveness.