claim: mutations in age and pathogen may affect the course of pandemic.
evidence_1: this point has to do with the evolution of the virus in the human host.", "later on, the spread of the infection reduces the pool of susceptible hosts and may reverse the selection on virulence.", "infectious sources are susceptible to evolution, and selective pressure by host characteristics and measure to control the pandemic may lead to emergence of more aggressive or indolent strains.", "more specifically, we expect drastic changes of virulence between early and later stages of global pandemics, but also between different stages of the pathogen life cycle."
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  )