Yeasts from the genus Candida cause many infections, not only in female genitals.
https://en.wikipedia.org/wiki/Candidiasis
A common modern cause for infections in mouth or throat are cortison aerosols, that are usually used for the therapy of asthma. After using them, the mouth and throat should be rinsed.

Assuming that's an old-fashioned beekeeping mask?

JChance4d4 said in comment #2589235:

Assuming that's an old-fashioned beekeeping mask?

That's a set with her hood, which does serve as a good substitute for beekeeping mask (and in fact, was to-go method back then was repurposing a woven basket's lid).