What condition can present with a stuck gray membrane in the pharynx?

The presence of a stuck gray membrane in the pharynx is a classic presentation of diphtheria. Diphtheria is caused by the bacterium Corynebacterium diphtheriae, which can lead to the formation of a thick, adherent membrane in the throat and produces toxins that can cause severe complications. This membrane can obstruct breathing and is often a prominent clinical feature.

In comparison, other conditions listed do not typically present with a gray membrane. Strep throat, caused by Streptococcus pyogenes, usually features red and swollen tonsils, sometimes with white patches or streaks, but not a gray membrane. Candidiasis in the pharyngeal area, also known as oral thrush, typically presents with white lesions that can be scraped off, rather than a membranous formation. Viral pharyngitis, caused by various viruses, presents more typically with redness and swelling of the throat and does not have the specific membrane seen in diphtheria. Therefore, the presence of a stuck gray membrane in the pharynx most accurately points to a diagnosis of diphtheria.