You have to take it in TWO shots. This kind of rna scrambling vaccine production has never been used on a population before.

The unknowns: are the effectiveness in people prone to severe infections vs. those that would have mild symptoms. Flu vaccines tend to not help severe flu victims.

We don't know about lifetime immunity but are treating it like the temporary flu shot.

Naturally we don't know of long term complications but odds are its way better to take it.

I had a reaction to a flu shot of muscle paralysis but the symptoms were brief - only 5 minutes. (petite barr syndome)