A senior adviser at the State Department and expert on Indian and South Asian affairs is accused by the Justice Department of printing out classified documents and storing more than 1,000 pages of highly sensitive government records in filing cabinets and trash bags at home.

Ashley Joachim Tellis, an unpaid senior adviser, is facing a felony charge of unlawful retention of national defense information.

Ashley Tellis, an expert on South Asian affairs, was arrested after the F.B.I. said federal agents found hundreds of pages of sensitive government records at his home in Virginia.

The state Department of Health said Tuesday that the virus, which has been spreading in China and elsewhere, was identified in a person living in Nassau County on Long Island.