Why is there no vaccine against the common cold, SARS, MERS, or HIV?

Why is the flu vaccine worse than doing nothing at all?

The common cold, SARS, MERS, HIV, flu, & coronavirus all mutate too fast.

There will never be a safe & effective coronavirus vaccine.

Focus on cures.
Shortly after researchers discovered that coronavirus has already mutated several times (making it a bad candidate for a vaccine) articles immediately appeared in major newspapers declaring that coronavirus is stable! & a great candidate for a vaccine! That's Pharma propaganda.
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