What was different about this outbreak? We had identified it as Lassa. Doctor Isabella Casal was one of the world's leading Virologists. Her work at the Pasture Institute came on the top of a brilliant career in the field of Virology working with the likes of Don MacCormick. Doctor MacCormick and Doctor Casal were probably the worldÂ's foremost experts on the Lassa virus. Santiago trusted her work and her opinion. In his experience with her in the past he had never known her to make a mistake in the identification of a virus. She was sure this was Lassa. It looked like Lassa and responded to Lassa antibodies, although not as strongly as she had known in the past. No matter how pure she made the sample of Lassa and how many antibodies she added to the mixture it would not react strongly, but it did react. It was Lassa, she would bet her career on it. But deep down inside she had a feeling that it was a different Lassa. Somehow it had the ability to be more resistant to the antibodies even if only for a short time. This meant that it had the ability to be more of an infection obstacle for the antibodies than did the usual virus.