The quarantine can be regarded as an "invisible barrier" that prevents the virus from spreading.
Explanation:
The curve of infections increases when the virus's infection rate in the population greater than 1. The emigration is one of the most important density-dependent limiting factors responsible for increasing the curve of infections, while immigration and the death rate are factors that reduce its maximum value.
The endomembrane systemis a group of membranes and organelles in eukaryotic cells that works together to modify, package, and transport lipids and proteins.