Explanation:

The Lassa fever-causing virus is found in West Africa and was first discovered in 1969 in Lassa, Nigeria.

• Spread: The fever is spread by rats and is primarily found in countries in West Africa including Sierra Leone, Liberia, Guinea, and Nigeria where it is endemic.
• Symptoms: Slight fever, fatigue, weakness and headache and more serious symptoms include bleeding, difficulty breathing, vomiting, facial swelling, pain in the chest, back, and abdomen and shock.

Prevention & Treatment: The best way to avoid getting infected is to avoid contact with rats.

• Ribavirin, an antiviral drug, has been used to successfully treat Lassa fever in patients.

Hence only statement 1st is correct.