Typically any form of population growth can be modeled as exponential. Any type of percentage growth rate is already an exponential since P=P(0)*e^rt in the mos

Typically any form of population growth can be modeled as exponential. Any type of percentage growth rate is already an exponential since P=P(0)*e^rt in the most simple case. The main limitations on this would be the carrying capacity of the environment. Or treatment. Carrying capacity would be as if everyone is sick and there are no new hosts or the population has dropped to such levels chance of infection due to contact decreases. And obviously growth rate would also change if the treatment status quo changes