What were the possible sources for the virus that Monet caught

1) Possibly he touched guano from the bats;

"These bats were insect eaters, and the guano was an ooze of digested insects. Did Monet put his hand in the ooze?"

2) Monet loved to play with wild monkeys and feed them by hand.

3) Monet may have contrated the virus from a wild bird.

"They say that one day near Christmas he carried a sick bird into his house, where it died, perhaps in his hands. The bird may have been a weaverbird--no one knows--and it may have died of a Level 4 virus--no one knows."