Type a-human, bird, pig; b-human; c-human and pigs. Antigenic shift on a, antigenic drift on a, b and c. Acidification or acid bath. (this is typical for influenza, the proton pump etc. ) Disease symptoms: (suppose you are a doctor) high fever, running nose and eyes, sneezing, etc. Note: a question about hep. a will be on the test. Note: yellow fever doesn"t occur in this part of the world. infected. Yellow fever viruses are adapted to replicate in mammals: like human, and particularly rodents, growing in the bush and wilderness. Mosquitoes suck the blood from those animals, and they get. They spread from animals to animals and animals to humans. There are two cycles of the transmission. You have a fountain in the backyard, mosquitoes lay eggs in water and then they hatch. The other one is the forest cycle. In the forest, there are swamps and trunks of trees.