First, the yellow fever virus is phagocytosed by white blood cells. The phagocytosed white blood cell then travel through the lymph vessel. Since lymph node contain white blood and filter lymph, the yellow fever phagocytosed with white blood cell establish in the lymph node.
The yellow fever virus replicates in lymph nodes and in other immune system cells, the yellow fever pathogens reach the lymph node of humans from bite through mosquitoes.
<u>Explanation:</u>
The yellow fever is a viral disease that occurs for a short time, this disease is spread to the humans from mosquito's. Once it enters the blood stream through the bite of a mosquito it directly enters the blood stream and gets caught in the lymph nodes, these lymph nodes serve as sites for multiplication of these organisms.
