Bronchoalveolar lavage (BAL) is a technique utilized to diagnose lower respiratory tract illnesses. The premise is you basically put a tube in the lung, inject sterile saline and suction it back and now you have a specimen to diagnose infections, including covid19. When he said "inject it, into the lungs it could clean it" he may have been saying they are looking at a way to directly kill the virus in the lungs. While I've never heard of BAL being used therapeutically in this way, I don't pretend to know what the CDC or any government run research has shown. It could be theoretically possible to inject a "disinfectant" (not fucking bleach) but something that kills the virus, into the lungs to sterilize them. The virus is not only present in the lungs however. But, it's an interesting thought. It would have to be something absorbed by the lungs and that either inhibits viral replication or viral entry into the cell. Just some food for thought
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Specific recommendations based on guns I've shot/owned:
Rifles:
Marlin 22 lr https://www.marlinfirearms.com/rimfire/xt-series/model-xt-22
Ruger pc9 (9mm carbine)
https://ruger.com/products/pcCarbine/models.html
Savage axis 2 - 308 win
https://www.savagearms.com/content?p=firearms&a=product_summary&s=57093
AR15: ruger 556 or a for a cheaper ome palmetto state armory or diamond back (decent cheaper one) I would get a 556 chambered one as it can fire .223 or 556 (.223 is the civilian round, 5.56 is the "military round", performance wise theres negligible difference between the 2 but the 5.56 makes more pressure and a gun made for 223 cannot safely shoot it, the benefit is you can buy 223 or 556 which makes it more flexible)
https://www.ruger.com/products/ar556/models.html
Pistols:
Smith and wesson m&p shield 9mm great first pistol. Reliable, accurate (enough) and used by a lot of law enforcement friends of mine. https://www.smith-wesson.com/firearms/mp-9-shield-0
Sig p365 is literally the best pistol I've ever shot in my life, a lot of money, but literally insane accuracy.
https://www.sigsauer.com/products/firearms/pistols/p365/
I'm not at all a glock guy, which pisses a lot of gun guys off, but I do not like them. I hate that they don't have a safety, yes I know the trigger has a built in safety where if you don't intentionally pull it, it wont fire but I've seen too many accidental discharges during my time in the ER to want one. I also think they feel cheap as fuck. But a lot of my cop and military buddies hate on me.
If I had to pick 2 guns to have for the rest of my life, the ruger pc9 carbine and the sig p365 without a doubt. I love my AR and my other guns but the ruger has a button where the barrel comes off and it fits in a back pack or in my case a bug out bag. The sig shoots the same 9mm, I bring all the same ammo with me and I'm ready to rock. Next would be the 308 if I got a 3rd so I can do bigger game hunting.