Just had a discussion with a doctor about vaccine's in general and flu in particular. I didn't want to start a fight with him, he seemed like a nice guy but I'd venture to say, I've done more research than he on this topic.
I asked him if he thought it was better to actually get the flu because you get lifetime immunity from that strain and he claimed that was incorrect. Everything I've found says I'm correct.
So don't use that MERV 13 unless you have a depressed immune system to begin with. Your overall health will thank you.
And as an HVAC tech, your equipment and I will thank you. http://content.time.com/time/health/art ... 07,00.html
Q: How long do flu antibodies last?
A: According to our study, it appears they can last the entire lifespan of the human organism — 90 years plus.