Health and Human Services Secretary Alex Azar participates in a forum called Generation Next at the Eisenhower Executive Office Building in Washington on March 22. (Leah Millis/Reuters)

Health and Human Services Secretary Alex Azar was hospitalized Sunday night after receiving intravenous antibiotics for an unspecified “minor infection,” according to a statement from the department.

The statement, issued shortly after 8:30 p.m., said that Azar, 50, “was treated” earlier in the evening and was admitted to a hospital for observation “out of an abundance of caution.” The statement left many questions unanswered, including the nature of the secretary’s infection, how long he has had symptoms, why a minor infection required IV antibiotics, and whether he is hospitalized in Washington or Indianapolis, where he returns many weekends because his family is still living there.

One person who received a brief call from Azar on Sunday night said the secretary said he was “doing fine” and was doing work from the hospital. The person, speaking about private medical issues on the condition of anonymity, said that Azar had been at his office late last week and was expected to return soon.

Caitlin Oakley, an HHS spokeswoman, said: “We cannot disclose the hospital location due to privacy and security concerns.”

Azar succeeded Tom Price as HHS secretary on Jan. 29.