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We do, to an extent. Prob is that viruses have a lot of variability and are capable of shifting "strains" quickly. Fortunately, our natural immunity provides increased protection after infection with different bugs.So we don't build immunity to common cold viruses? I thought we did. Problem is, there are so many of them.
I thought that we did build immunity from other corona viruses
From UpToDate:
Most of the respiratory viruses that cause colds are capable of reinfection after reexposure [1]. However, subsequent infections with the same or similar agents are generally milder and of shorter duration [8]. The molecular and genetic basis for incomplete cross-protection following infection with one strain is not fully understood. However, data from rhinoviruses suggest that this may be due in part to a remarkable degree of structural and molecular variability, both within serotypes and between the divergent field strains that frequently arise from a given reference virus