[Faun]

@desiibond

A new strain is caused by mutation only. There can be other factors too. But what I have gleaned from various links (also from high school bio) is that there are far less chances of it compared to the common cold virus (which has over 200 strains, happily mutating forever).

I agree that the person, who has recovered successfully, will be immune to that particular strain which got him infected but may not be to the another strain (again its a probability). Even that immunity memory lasts for months or years but not for life.

A vaccine is generally targeted at class of closely related strains and may fail for any altogether different mutation.

A healthy person can recover from Swine flu without any need of special treatment. It depends upon at how much rate one's immune system can churn out the expected response against the cascading reproduction of virus in host cells.

Also, an agitated immune response can also cause more harm than relief. In worst cases the killer cells will be blind enough to kill one's own healthy cells too, thereby damaging necessary organs. The reason why we are seeing people b/w 20-30 dying too.

We are at the mercy of viruses...lol.

@abhijangda

I agree with the part about hundreds of variants but not with complete but rather vague explanation. Thanks.