UPDATE: Bronson Arroyo diagnosed with mononucleosis

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UPDATE: According to Mark Sheldon of MLB.com, Bronson Arroyo has been diagnosed with mononucleosis. A number of players have missed considerable time with the illness — Jed Lowrie is one recent example — but Arroyo told Sheldon via text message that he does not expect to miss any starts. We’ll see about that one.

2:12 PM: Bronson Arroyo felt good enough to throw 87 pitches in yesterday’s start, but John Fay of the Cincinnati Enquirer reports that he has “a lingering cough” and underwent blood tests to check for valley fever.

Here’s the definition of valley fever from WebMD.com:

A disease also called coccidioidomycosis due to a fungus called Coccidioides immitis. About 40 percent of people infected with this fungus develop symptoms. Most often they have an influenza-like illness with fever, cough, headaches, rash, and myalgias (muscle pains).

That may not sound particularly worrisome, but valley fever is what caused Conor Jackson to miss nearly all of 2009 while playing for the Diamondbacks and questions about his health lingered into 2010. It can definitely be a very serious thing, but Arroyo told Fay that he expects to make his April 3 start and “they just want to get me on the right medication.”