Does gargling have a preventive effect?

Does gargling have a preventive effect?

In the first place, it is only temporarily washed away when you gargle, it does not prevent the exposure of the virus, and it has been thought that it is meaningless because the idea is the same as sterilization ♪.
This is the same for hand washing, and if you sterilize with soap, your immunity will be weakened more easily.
In the first place, even if you think only from Western medicine, there are few studies that gargling and hand washing are effective in preventing influenza virus infection.

Then there is an interesting study when it comes to whether gargling is ineffective.
What happens when it gargles with Isodine (iodine)?
In other words, there is data that gargling with Isodine is not as good as just water.
It seems that this was experimented by Professor Takashi Kawamura's group at Kyoto University, and the subjects were assigned to the "non-gargle group", "water gargling group", and "iodine gargling group" to verify the cold prevention effect of gargling. Masu ♪.

Then, the results were announced at the rate of those who caught a cold, 26.4 out of 100 people who did nothing, 17 people who were gargling with water, and people who were gargling with iodine solution. Was 23.6 people.
It seems that Ichio has a little effect, but if you raise your immunity every day, you won't gargle or gargle.
But what's interesting here is that iodine is less effective than just water, with a 40% reduction being only a 12% reduction.
This is natural if you think about it for a moment.

Also, there seems to be some research that green tea is effective for gargling.
This is a study by Hamamatsu University School of Medicine, but it may not be overkill.
That's because it's Hamamatsu, but green tea these days uses a lot of pesticides and tolerances compared to other foods, so it's better to use good green tea or old green tea.
Perhaps I was able to prevent a cold, but social poisons may accumulate, and the history of Japanese illnesses over the past few decades is the same because of the composition of sterilization ⇒ modern illness.

That's why I'm annoyed and it doesn't mean much, and I haven't had any infectious diseases in the last few years with immunity, so I don't gargle or mask.
At least people who gargle with Isodine may be collectively called "stupid" ♪.
Well, I don't force myself to wash my hands, but I think I wash them with water before eating.