For example, a confirmed case category might have had three criteria: “suspected case, laboratory-confirmed by reverse transcription–polymerase chain reaction (RT-PCR),” “suspected case, laboratory-confirmed by IgM (immunoglobulin M) antibody presence,” or “suspected case with a positive laboratory test.” Alerts at points of entry (where travelers were screened for Ebola) were considered an additional category; point of entry alerts were either an independent category or described within the “community alert” category. Here, CD40LG is linked to Ebola hemorrhagic fever.