Searching for an ACD Canon Fic - Undercover Holmes/malaria-relapse Watson

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I read this a while ago and I'm almost entirely certain it was an ACD canon fic. Watson accepts a summons to treat someone's illness and Holmes, disguised as a gardener, follows him. Holmes observes that Watson shows signs of a malaria relapse / enteric fever episode as he and Watson attempt to protect some young lady. Things come to a head. Watson (and secretly Holmes) save the day. Watson falls ill, Holmes sneaks in and cares for him.

Does this sound familiar to anyone?

ETA: FOUND