Introducing a vaccine into a situation where there is an ongoing outbreak will only expose the virus to an under-developed vaccine induced immune response, allowing the virus to quickly evolve to circumvent the vaccine.
This is how you get things like MRSA and golden staph. Medicine-resistant strains of pathogens, in other words.
How much testing are they doing to get ~300k positive test results per day? They MUST be ramping up testing massively. Suppose they were getting 1-2% positive rate for test, a few weeks ago they were getting <20k positive per day. 300k is 15 times as many cases. They have either massively ramped up testing, or they are now getting ~30% positive rate (which would be absurd when other areas of outbreak are generally <3% positive rate for those tested).
I personally think its got something to do with the vaccine. There's quite a few in India who have at least 1 dose of it, and it's shown in several studies of previous attempted coronavirus vaccines that test subjects would seem to have gained immunity, but when exposed to the wild virus their immune systems went into hyperdrive and killed the test subjects. I think this is the first part of that hyperdrive immune response from the vaccine.
Note, this is just my theory, I don't have training in virology, this is just coming from reading the medical literature and forming my own conclusions with events in real time.
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