Any process that stops, prevents, or reduces the frequency, rate or extent of isotype switching to IgA isotypes.
Synonyms:
exact_synonym:
down regulation of isotype switching to IgA isotypes; downregulation of isotype switching to IgA isotypes; negative regulation of class switch recombination to IgA isotypes; negative regulation of class switching to IgA isotypes; negative regulation of isotype switch recombination to IgA isotypes