Discussion
Mercurial compounds have largely been abandoned as antiseptics because they are
Answer: B
Correct answer: toxic and only weakly active
Mercurials such as mercurochrome and thiomersal are bacteriostatic rather than bactericidal, are readily inactivated by organic matter, and carry the toxicity of mercury with its environmental persistence. The combination of modest benefit and real harm is what displaced them once effective alternatives such as chlorhexidine and povidone-iodine became available.
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