The countries where they do the most nasal irrigation have really low covid infection rates.
Follow-up research on nasal irrigation shows that betadine is important as an ingredient in the solution used to rinse. Betadine is doing the virus killing while the other ingredients are doing the dilution and cleaning.
New studies show a loss of grey matter in the brain. This could be what contributes to loss of smell, PTSD, and other long covid effects. The delta variant starts replicating quickly before hitting the bloodstream. It hits the brain, replicating, and erroding. This mechanism of replication takes a long time. It gives healthcare providers a window of opportunity to abate the virus.
The accelerated time frame with the Delta variant is in part because it’s breathed in from the nose to the lungs. Decreased viral load with gargling is also an option that is beginning to get some support in studies.