A U.S. air marshal has been hospitalized in Houston after being attacked with a syringe at an airport in Lagos, Nigeria. He is being watched for potential Ebola symptoms, as Nigeria is one of the countries suffering through the outbreak of the lethal virus. “Out of an abundance of caution, the Centers for Disease Control and Prevention conducted an on-scene screening of the victim when United Flight 143 landed in Houston early Monday morning,” the FBI said in a statement. Thus far, the victim has not shown any signs of Ebola and does not pose a threat to others, but there are severe concerns about the virus’ spread. The UN predicted Ebola will infect as many as 20,000 people and take six to nine months to contain.