Nigeria's National Security Adviser has issued a warning about gaps in Ebola screening at the country's borders. This alert follows the discovery of an imported case of the virus. Officials are now ordering a tighter surveillance regime to prevent further outbreaks. The move aims to close security loopholes at entry points. Security agencies must now ensure more rigorous checks for all travelers. This directive comes as a response to the risk posed by international travel. The government wants to avoid a widespread health crisis.